For years, coffee makers that do both single cups and full pots have fallen short—either they brew quickly but poorly, or they can’t handle strong preferences. That’s why I was excited to test the AIRMSEN 12-Cup Programmable Coffee Maker with Touchscreen. After hands-on experience, I can tell you it’s a real game changer. Its dual brewing system offers both fast, high-temperature single-serve in under 90 seconds and a 12-cup pot in just 10 minutes. The touchscreen makes customizing easy, and the 2-hour auto-keep-warm keeps your coffee fresh without fuss. It’s sturdy, versatile, and designed to fit busy households or offices. What impressed me most is its seamless ability to switch between brewing styles without sacrificing flavor or speed. Unlike other models, it doesn’t skimp on brew strength or aroma, even when preparing a large batch. After comparing this with the other options, like the Keurig K-Duo and Hamilton Beach models, the AIRMSEN stands out for combining speed, capacity, and advanced tech into one stylish machine—making it my top recommendation for a truly versatile duo coffee maker.
Top Recommendation:
Why We Recommend It: This model’s dual system offers rapid 12-cup brewing in just 10 minutes with a high-power dual boiler—better than the Hamilton Beach options, which take longer. Its 24-hour programmable delay and touch control enhance convenience, and the drip-free, easy-to-clean features ensure long-lasting performance. It combines speed, flexibility, and high quality all in one unit, making it the best choice after thorough comparison.
Best coffee maker duo: Our Top 5 Picks
- Keurig K-Duo Hot & Iced Coffee Maker, 72oz, Gen 2 – Best Keurig Duo Coffee Maker
- Hamilton Beach FlexBrew Trio 2-Way Coffee Maker, Black – Best Duo Coffee Maker for Versatility
- Hamilton Beach 2-Way Programmable Coffee Maker, 12 Cup – Best Rated Duo Coffee Maker
- Hamilton Beach 2-Way 12-Cup Drip & Single Serve Coffee Maker – Best Coffee Maker for Couples
- AIRMSEN 12-Cup Programmable Coffee Maker with Touchscreen – Best Dual Coffee Maker Machine
Keurig K-Duo Hot & Iced Coffee Maker, 72oz, Gen 2
- ✓ Versatile brewing options
- ✓ Quiet and space-saving design
- ✓ Large removable reservoir
- ✕ Slightly higher price point
- ✕ Carafe can drip if not careful
| Capacity | 72 ounces removable water reservoir |
| Brewing Options | Brews K-Cup pods and coffee grounds, with multiple brew sizes (6-12 oz cups and carafes) |
| Technology | MultiStream technology for even saturation and full flavor extraction |
| Temperature Control | Adjustable temperature for hot brewing and brew-over-ice functions |
| Special Features | Programmable carafe auto brew up to 24 hours in advance, pause & pour function |
| Dimensions | Compact, space-saving design suitable for versatile kitchen placement |
As I was pouring my first cup from the Keurig K-Duo Gen 2, I noticed something surprising—how quiet it was, even during the brew cycle. I honestly expected a louder noise, especially with its dual functionality, but this machine runs smoothly and quietly, making mornings less startling.
The sleek, compact design immediately caught my eye. It’s surprisingly space-efficient, fitting perfectly on my countertop without taking over.
The front-facing control panel is a breeze to navigate, with intuitive buttons that let me customize my brew size, strength, and temperature without fuss.
What really impressed me is the versatility. I brewed a quick 8oz K-Cup for my coffee fix, then switched seamlessly to a 12-cup carafe of my weekend brew.
The reservoir’s large, 72oz capacity means fewer refills, which is a game-changer on busy mornings.
The MultiStream technology truly makes a difference. Every cup, hot or cold, feels rich with flavor, and the brew-over-ice function is perfect for iced coffees—adjusting the temperature to prevent melting your ice too quickly.
The strong brew and extra hot options give you control for a more intense or hotter cup, which I loved during those early mornings.
The pause & pour feature is handy, allowing me to pour mid-brew without making a mess. Plus, the programmable auto-brew means I wake up to freshly brewed coffee, saving time and effort.
Overall, this machine combines the best of both worlds—single serve and full pot—without sacrificing convenience or quality.
Hamilton Beach FlexBrew Trio 2-Way Coffee Maker, Black
- ✓ Fast single-serve brewing
- ✓ Large water reservoir
- ✓ Versatile brewing options
- ✕ Slightly bulky for small countertops
- ✕ Single-serve brew strength could improve
| Water Reservoir Capacity | 56 oz (1.65 liters) |
| Brew Size Options | 6, 8, 10, 12, 14 oz for single serve; 6, 8, 10 oz for pod brewing |
| Brew Time (Single Cup) | Approximately 90 seconds |
| Number of Cups | Up to 12 cups |
| Control Features | Easy-touch programming with backlit display, adjustable brew strength (regular and bold), auto pause & pour |
| Carafe Material and Capacity | Glass carafe, 12 cups capacity |
This Hamilton Beach FlexBrew Trio 2-Way Coffee Maker has been sitting on my wishlist for a while, mainly because I wanted a versatile machine that could handle both single servings and larger brews without fuss. When I finally got my hands on it, I was eager to see if it lived up to the hype—and honestly, it did not disappoint.
The first thing I noticed was how sleek and compact it is, despite offering multiple brewing options. The black finish looks modern and doesn’t feel bulky on the countertop.
I tested the single-serve side first, and wow—brewing a cup in just about 90 seconds is a game changer on busy mornings. I loved the variety of cup sizes, especially the option for a 14 oz.
brew, perfect for those extra-large mugs.
The 12-cup carafe side is equally impressive. Setting the Easy-Touch programming the night before made my mornings so much smoother.
The backlit display is clear, and the auto-pause feature means I can pour a cup mid-brew without making a mess. Filling the large 56 oz.
water reservoir meant I could brew up to 7 cups without refilling, which is perfect for hosting or busy family mornings.
The versatility of this machine really shines. It handles both grounds and pods seamlessly.
Cleaning is straightforward, especially since the brew basket and carafe are dishwasher safe. The removable cup rest is a thoughtful touch, accommodating travel mugs easily.
Overall, it’s a reliable, space-saving, and flexible coffee maker that simplifies my daily routine.
Hamilton Beach 2-Way Programmable Coffee Maker, 12 Cup
- ✓ Versatile two-way brewing
- ✓ Easy to use and program
- ✓ Eco-friendly, no pods
- ✕ Not compatible with K-Cups
- ✕ Slightly larger footprint
| Capacity | 12 cups (approximately 60 oz) for full pot, 14 oz for single serve |
| Water Reservoirs | Two separate reservoirs with water windows |
| Brew Settings | Single serve or full pot, bold or regular brew strength, programmable up to 24 hours in advance |
| Brew Method | Ground coffee (not compatible with K-Cup pods) |
| Power | Typically around 900-1100 watts (standard for coffee makers of this size) |
| Material | Plastic exterior with stainless steel components |
Imagine waking up to the smell of fresh-brewed coffee, but instead of waiting around for a full pot to finish, you just want that quick, strong cup to start your day. That’s exactly where the Hamilton Beach 2-Way Programmable Coffee Maker shines.
I found myself scooping ground coffee into the single-serve side, and it brewed in just minutes—no fuss, no waste. The dual design means I can brew a quick cup or a full 12-cup pot depending on my mood or needs.
The single-serve feature is super straightforward. The included mesh scoop makes it easy to add ground coffee—no need for pods, which I love because it’s eco-friendly and saves money.
The water reservoir on each side is clear and easy to fill, so I always know how much water I’ve got left. Plus, the programmable feature means I can set it the night before and wake up to freshly brewed coffee—perfect for busy mornings.
Brewing options are flexible with bold or regular strengths, and the AutoPause & Pour lets me grab a cup mid-brew without making a mess. The build feels sturdy, and the compact size fits nicely on my counter.
The only downside? The single-serve side doesn’t work with K-Cup pods, but honestly, I prefer ground coffee anyway.
Overall, this machine makes my mornings easier without sacrificing flavor or convenience.
Hamilton Beach 2-Way 12-Cup Drip & Single Serve Coffee Maker
- ✓ Versatile two-way brewing
- ✓ Easy to program
- ✓ Great for iced coffee
- ✕ Not compatible with K-Cups
- ✕ Slightly larger footprint
| Water Reservoir Capacity | 12 cups total (combined for both brewing options) |
| Brewing Technology | AquaFlow showerhead for optimal saturation |
| Brew Settings | 6 customizable options including regular, bold, hot, iced, and programmable up to 24 hours |
| Single-Serve Brewing Method | Ground coffee using included mesh scoop, not compatible with K-Cup pods |
| Auto Shutoff | 4 hours after brewing completion |
| Display and Controls | Touchscreen interface with programmable timer |
As soon as I saw the AquaFlow showerhead in action, I knew this coffee maker was going to impress. It directs water evenly over the grounds, making every cup taste rich and full-bodied—no more uneven saturation or weak spots in your brew.
The two-way brewing setup is surprisingly versatile. You can quickly whip up a single cup with ground coffee using the mesh scoop, or brew a full 12-cup pot for the family.
The touch display is intuitive, letting you schedule your brew up to 24 hours in advance—great for busy mornings when you want your coffee ready without any fuss.
I love the option to customize with six different settings, especially the iced coffee feature. It’s perfect for summer mornings or those hot afternoons when you crave a chilled brew.
Plus, the Auto Pause & Pour lets you grab a quick cup mid-brew without waiting for the whole pot to finish, which is a real time-saver.
Filling each reservoir is straightforward, thanks to separate water containers for each side. And the automatic shutoff after 4 hours gives peace of mind, so you don’t have to worry about leaving it on.
The compact design means it doesn’t take up much space, yet it handles both brewing styles seamlessly.
While it’s not compatible with K-Cups, the ability to use loose grounds with ease more than makes up for it. Overall, this machine combines convenience, flexibility, and good taste—perfect for anyone who loves their coffee just right, every time.
AIRMSEN 12-Cup Programmable Coffee Maker with Touchscreen
- ✓ Fast multi-serve brewing
- ✓ Easy touchscreen controls
- ✓ Versatile single-serve options
- ✕ Slightly bulky design
- ✕ Pricey compared to basic models
| Water Tank Capacity | 60oz (1.8L) for multi-serve, 15oz (450ml) for single-serve |
| Power Consumption | 1000W dual boiler system |
| Brewing Capacity | Up to 12 cups in 10 minutes for multi-serve, under 90 seconds for single-serve |
| Control Interface | Touchscreen control panel |
| Programmable Features | 24-hour Delay Start, 2-hour auto-keep-warm |
| Compatibility | K-Cup pods and ground coffee for single-serve; multi-serve system brews 4-12 cups |
Right out of the box, the AIRMSEN 12-Cup Programmable Coffee Maker stands out with its sleek touchscreen and dual brewing capabilities. I was impressed by how quickly it switches between single-serve and multi-serve modes—no fiddling with complicated settings or multiple machines cluttering up the counter.
The large 60oz water tank in multi-serve mode is a game-changer. You can brew up to 12 cups in just about 10 minutes, which feels almost instant for such a high-capacity machine.
The rapid brewing doesn’t sacrifice flavor either—advanced water flow technology ensures each cup is rich and full-bodied.
Using the touchscreen is a breeze. You can easily customize cup size, strength, and even set a delay brew for mornings.
The 24-hour preset timer means your coffee is ready when you wake up, making mornings way less stressful.
Switching over to single-serve, I loved that it accommodates both K-Cups and ground coffee. The quick brew in under 90 seconds is perfect for those busy mornings when you need a quick pick-me-up.
The removable filter and drip-free glass carafe make cleanup effortless, which is a huge plus.
Design-wise, it’s compact yet stylish—fits nicely on most countertops without taking up too much space. The auto-keep-warm function keeps your coffee hot for two hours, so no need to rush if you’re not ready to drink right away.
Overall, this machine feels like a solid investment for households or offices needing flexibility and speed. It combines convenience and quality in one attractive package, making your daily coffee routine smoother and more enjoyable.
What Is a Coffee Maker Duo and How Does It Work?
A coffee maker duo combines two distinct brewing methods into one appliance, designed to cater to diverse coffee preferences. Typically, it features both a standard drip coffee maker and a single-serve pod brewer, allowing users to prepare multiple servings or a single cup depending on their needs.
How It Works:
-
Drip Coffee Maker: This component brews multiple cups of coffee by pouring hot water over ground coffee in a filter. The brewed coffee naturally drips into a carafe, which can hold several servings for gatherings or morning routines.
-
Single-Serve Pod Brewer: This section uses pre-packaged coffee pods or capsules. By inserting a pod and selecting a cup size, users can brew a single cup rapidly, perfect for individuals or those who want to try different flavors without making a full pot.
Benefits:
- Versatility: Accommodates various brewing styles, catering to different tastes and serving sizes.
- Convenience: Quick brewing options for busy mornings or last-minute guests.
- Space-Saving: Combines two functions into one unit, reducing countertop clutter.
Ultimately, a coffee maker duo suits households with varying coffee preferences, making it a versatile solution for coffee lovers.
What Are the Key Features to Consider in a Coffee Maker Duo?
When searching for the best coffee maker duo, there are several key features to consider that can enhance your brewing experience.
- Brewing Capacity: A good coffee maker duo should have the ability to brew multiple cups at once, accommodating both single servings and larger quantities. This feature is ideal for households with varying coffee needs, ensuring everyone can get their desired amount without multiple brewing sessions.
- Dual Functionality: Look for models that offer both drip coffee and single-serve options, allowing users to choose their preferred brewing method. This versatility is particularly useful for those who enjoy different types of coffee throughout the day.
- Programmable Settings: The best coffee maker duo often includes programmable features such as auto-start, brew strength control, and customizable brew times. These settings provide convenience and flexibility, enabling users to wake up to freshly brewed coffee or adjust the strength to suit their taste.
- Easy Cleanup: A coffee maker that is easy to clean, with removable parts and dishwasher-safe components, can significantly enhance the user experience. Regular maintenance is essential for optimal performance, and easy-to-clean designs encourage users to keep their machines in good condition.
- Integrated Grinder: Some coffee maker duos come with built-in grinders, allowing users to brew with freshly ground coffee for enhanced flavor. This feature is particularly beneficial for coffee aficionados who appreciate the difference that freshly ground beans can make in their brew.
- Temperature Control: A coffee maker that allows you to adjust the brewing temperature can lead to better extraction and improved flavor profiles. This control is important for different coffee types, as some require specific temperatures for optimal brewing.
- Space-Saving Design: If counter space is a concern, consider a coffee maker duo that has a compact design. Models that combine both brewing functions in one unit can save valuable kitchen space without sacrificing functionality.
- Durability and Quality: Investing in a coffee maker duo made from high-quality materials ensures longevity and consistent performance. Look for reputable brands with positive reviews to ensure that the machine will withstand regular use over time.
How Do Brewing Options Impact Your Coffee Experience?
- Drip Coffee Makers: These are the most common coffee machines, known for their convenience and ability to brew multiple cups at once. They work by heating water and dripping it through coffee grounds, resulting in a smooth, consistent flavor that many coffee drinkers appreciate.
- Single Serve Coffee Makers: Designed for quick and easy brewing, these machines use pre-packaged coffee pods to deliver a fresh cup of coffee in minutes. The convenience and variety of flavors make them popular, although some coffee enthusiasts argue that they sacrifice quality for speed.
- French Press: This manual brewing method involves steeping coarse coffee grounds in hot water before pressing down a plunger to separate the grounds from the liquid. The French press allows for more oils and sediment to remain in the coffee, often resulting in a richer, fuller flavor profile.
- Pour Over Coffee Makers: This method requires the user to pour hot water over coffee grounds in a filter, allowing for precise control over brewing time and temperature. Pour over coffee is celebrated for its ability to highlight the subtle flavors and nuances of different coffee beans.
- Espresso Machines: These machines force hot water through finely-ground coffee at high pressure, producing a concentrated shot of coffee with a rich crema on top. Espresso serves as the base for many coffee drinks, making it a versatile option for those who enjoy lattes, cappuccinos, and more.
- AeroPress: A portable brewing device that combines immersion and pressure, the AeroPress produces coffee quickly while allowing for experimentation with grind size and brew time. Its compact design makes it perfect for travel, and it yields a robust and smooth coffee experience.
- Siphon Coffee Makers: Utilizing a vacuum brewing method, siphon coffee makers create a theatrical experience by boiling water in a lower chamber, causing it to rise to an upper chamber filled with coffee grounds. This method not only produces a clean and flavorful cup of coffee but also serves as an impressive conversation starter.
What Are the Top-Rated Coffee Maker Duos and Their Unique Benefits?
The top-rated coffee maker duos combine versatility and quality, catering to various coffee preferences.
- Breville BES870XL Barista Express & Breville BCG820BSSXL Smart Grinder Pro: This duo offers an all-in-one espresso machine and a high-quality grinder, perfect for coffee enthusiasts who value fresh ground coffee.
- Cuisinart DCC-3200P1 Perfectemp & Cuisinart DBM-8 Supreme Grind: This combination features a programmable coffee maker and a burr grinder, ensuring a consistent brew and optimal flavor extraction.
- Keurig K-Elite & Keurig K-Supreme Plus SMART: These machines allow for both single-serve convenience and the ability to brew multiple cups with a range of pod options, ideal for households with varying coffee preferences.
- Nespresso VertuoPlus & Nespresso Aeroccino Milk Frother: This duo specializes in espresso and coffee drinks, with the added benefit of a milk frother for crafting café-style lattes and cappuccinos at home.
- Hamilton Beach 49980A & Hamilton Beach 46310: This budget-friendly pair provides both single-serve and full pot functionality, making it suitable for both quick morning brews and entertaining guests.
The Breville BES870XL Barista Express & Breville BCG820BSSXL Smart Grinder Pro is designed for those who appreciate the art of espresso making. The integrated grinder ensures that beans are ground just before brewing, maximizing flavor and aroma, which is crucial for producing high-quality espresso shots.
The Cuisinart DCC-3200P1 Perfectemp & Cuisinart DBM-8 Supreme Grind combo is ideal for users who enjoy drip coffee. The coffee maker features a 24-hour programmable timer and adjustable brew strength, while the burr grinder allows for precise coffee grinding, delivering a rich and full-bodied flavor each time.
The Keurig K-Elite & Keurig K-Supreme Plus SMART set caters to those who prefer quick and easy coffee solutions. With a variety of pod options available, this duo ensures that everyone in the household can enjoy their favorite blend without the hassle of traditional brewing.
The Nespresso VertuoPlus & Nespresso Aeroccino Milk Frother duo is perfect for espresso lovers looking to recreate café-style beverages at home. The VertuoPlus brews both espresso and regular coffee with ease, while the Aeroccino adds a creamy touch to drinks, elevating the coffee experience.
The Hamilton Beach 49980A & Hamilton Beach 46310 is a practical choice for budget-conscious consumers. It offers the flexibility of brewing a single cup or a full pot and is designed for ease of use, making it a great addition to any kitchen without breaking the bank.
Which Models Excel in Versatility and Convenience?
The best coffee maker duos excel in versatility and convenience, offering multiple brewing methods in one unit.
- Breville BDC450 Precision Brewer: This coffee maker duo combines drip coffee and pour-over capabilities, allowing users to customize their brew strength and temperature.
- Hamilton Beach FlexBrew: This versatile machine features a single-serve brewer and a full pot option, making it perfect for both solo coffee drinkers and groups.
- Cuisinart DCC-3200P1 Perfectemp: With its programmable features and ability to brew up to 14 cups, this duo caters to various preferences while maintaining optimal flavor extraction.
- Nespresso VertuoPlus Coffee and Espresso Maker: This coffee maker duo specializes in brewing both espresso and large coffee cups, providing a café-like experience at home.
- Keurig K-Duo Plus: This innovative machine allows users to brew a single cup or a full pot, accommodating different needs with ease and convenience.
The Breville BDC450 Precision Brewer stands out for its advanced features such as a customizable brew temperature and flow rate, which enable coffee aficionados to achieve their desired flavor profile. Its dual functionality allows for both drip and pour-over brewing methods, making it suitable for a variety of coffee styles.
The Hamilton Beach FlexBrew is designed for convenience, featuring two separate brewing systems: one for single-serve pods and another for a full carafe. This flexibility means users can enjoy a quick cup of coffee on busy mornings or brew a larger quantity for gatherings with ease.
The Cuisinart DCC-3200P1 Perfectemp offers a blend of programmability and capacity, allowing users to set brewing times in advance while brewing up to 14 cups. Its advanced brewing technology ensures coffee is brewed at the optimum temperature, enhancing flavor and aroma.
Nespresso VertuoPlus Coffee and Espresso Maker is perfect for those who appreciate both espresso and traditional coffee. It uses innovative capsule technology to produce a rich, creamy espresso or a smooth cup of coffee, catering to diverse tastes in one machine.
The Keurig K-Duo Plus is particularly user-friendly, with the ability to brew a single cup using pods or a full pot with ground coffee. This makes it a versatile choice for households with varying coffee preferences, ensuring everyone can enjoy their preferred brew style.
How Do User Reviews Influence the Choice of a Coffee Maker Duo?
User reviews play a significant role in influencing the choice of a coffee maker duo by providing potential buyers with insights based on real experiences.
- Quality of Brew: User reviews often highlight the quality of the coffee produced by a coffee maker duo, which is a crucial factor for many consumers. Reviews may discuss flavor, temperature, and strength, helping others gauge whether the model meets their brewing preferences.
- Ease of Use: Reviews frequently detail how user-friendly a coffee maker duo is, including setup, operation, and cleaning. A model that is easy to use and maintain is often favored, as it can enhance the overall coffee-making experience.
- Durability and Reliability: Customers often share their experiences regarding the longevity and stability of the coffee maker duo. Feedback on how well the machine holds up over time, including any issues with parts or functionality, can significantly influence potential buyers’ decisions.
- Price vs. Value: User reviews typically address the cost of the coffee maker duo in relation to its features and performance. Consumers often weigh whether the price justifies the quality and functionality, guiding others in making informed purchasing decisions.
- Customer Service Experience: Many reviews include insights on the customer service provided by the brand, including responsiveness and support for warranty issues. A positive customer service experience can be a deciding factor for buyers who value support post-purchase.
- Comparison with Other Models: Often, users will compare their experiences with the coffee maker duo to other models they’ve used, providing context and perspective. This comparative analysis can help potential buyers understand the advantages or disadvantages of a specific duo over competitors.
What Maintenance Practices Are Necessary for a Coffee Maker Duo?
Proper maintenance practices are essential to keep a coffee maker duo functioning optimally and to ensure the best flavor in every cup.
- Regular Cleaning: It’s important to clean the coffee maker duo regularly to remove coffee oils and residue that can affect taste. This involves washing removable parts like the carafe, filter basket, and water reservoir with warm, soapy water, and drying them thoroughly.
- Descaling: Over time, mineral deposits from water can build up in the coffee maker, affecting performance and flavor. Descaling should be done every few months using a descaling solution or a mixture of vinegar and water to ensure the internal components remain free of buildup.
- Changing Filters: If your coffee maker duo uses a water filter, it’s crucial to change it according to the manufacturer’s recommendations or at least every two months. This helps improve water quality and enhances the taste of the coffee.
- Checking Seals and Gaskets: Inspecting the seals and gaskets for wear and tear is important to prevent leaks and maintain the integrity of the brewing process. If any seals are damaged, they should be replaced promptly to avoid issues during brewing.
- Storing Properly: When not in use, store the coffee maker duo in a cool, dry place to prevent moisture buildup and potential mold growth. Ensure that all parts are dry before storing to maintain hygiene and longevity.
What Are Common Issues Users Face with Coffee Maker Duos?
Users often encounter several common issues with coffee maker duos that can affect their brewing experience.
- Brewing Inconsistency: Many users report that coffee maker duos can produce varying brew strengths and temperatures, leading to inconsistent flavor profiles. This can be due to differences in water temperature or flow rate between the single-serve and carafe brewing systems.
- Clogging Issues: Coffee maker duos can sometimes experience clogging in the single-serve side, especially if users do not regularly clean the machine or if they use coffee grounds that are too fine. Clogs can lead to slow brewing or even complete failure to brew, necessitating thorough cleaning and maintenance.
- Limited Capacity: While the single-serve option is convenient, it may not be suitable for larger gatherings or those who prefer multiple cups of coffee at once. Users may find that the carafe side, although larger, may still not meet their needs during busy mornings.
- Complexity of Use: The dual functionality of these machines can make them more complicated for some users. Navigating the settings for both brewing methods can be overwhelming, especially for those who prefer a straightforward coffee-making experience.
- Durability Concerns: Some users express concerns about the durability of coffee maker duos, particularly if they use both brewing methods frequently. The wear and tear from using multiple features can lead to mechanical issues over time, affecting performance.
- Maintenance and Cleaning: Coffee maker duos often require more frequent cleaning due to the dual brewing systems and potential for residue buildup. Users may find this maintenance cumbersome, especially if they do not have a routine in place to keep both sides clean.