Last week, a customer asked me something I’d never heard before. “Can I sublimate onto 3 oz espresso cups and shot glasses?” My first thought was, “That’s tiny.” My second thought was, “Wait, do they even make machines for that?” After a bit of digging, I found the answer is a definite yes. Let me save you the same confusion.

Why Would Anyone Want to Print on 3 oz Cups?

Three-ounce cups might sound like an odd niche, but they’re actually everywhere. Espresso shots at coffee shops. Shot glasses for bars and restaurants. Mini tasting cups for breweries and distilleries. Small sample cups for events. And of course, personalized gifts for friends who love their tiny drinks.

The market for these little guys is growing fast. Café want branded espresso cups. Bars want custom shot glasses for special events. Wedding favors. Corporate gifts. Even home coffee enthusiasts who want their morning espresso to look Instagram-worthy. There’s real demand here.

The Machines That Actually Work

Multifunction Mug Presses

Your easiest option is a multifunction mug press that comes with multiple attachments for different cup sizes. Some models, like the VEVOR 4-in-1 Mug Press, include attachments for standard mugs and also for smaller sizes like 1.5 oz and 3 oz cups. These machines are standalone units that let you swap heating elements depending on what you’re pressing. They’re perfect if you want one machine that handles everything from shot glasses to 15 oz coffee mugs.

Specialized Attachments for Tumbler Presses

Here’s a clever option. If you already own a tumbler heat press, you might not need a whole new machine—just a new attachment. Companies like SUNTEK make specific attachments designed for 3 oz straight sublimation mini skinny tumblers and 3 oz shot glasses. They also make attachments for tapered 3 oz shot glasses. These attach to compatible tumbler press machines, letting you swap between sizes in seconds.

The key is compatibility. These attachments use specific connectors (like 5-pin) and work with specific machine models. Always check compatibility before buying.

Conventional Ovens and Vacuum Machines

Here’s a surprising alternative. Some sublimation suppliers actually recommend using a standard kitchen oven for tiny cups. For example, one manufacturer suggests baking their 3 oz shot glasses at 400°F for 12-15 minutes in a regular oven. They also mention that a vacuum machine can cut that time to 7-10 minutes. This isn’t the most professional setup, but for small-batch hobby work, it’s a low-cost way to get started without buying specialized equipment.

The 3 Oz Cups You Can Actually Buy

None of this matters if you can’t find the blanks.

Ceramic Espresso Mugs are widely available. One supplier sells them in 6-packs for about $17, pre-coated for sublimation. These are perfect for coffee shops or home espresso setups.

Shot Glass Mugs exist too. Some have a white sublimation patch on the mug wall that makes colors pop, while the rest of the glass stays clear. The only catch is you need to keep your design within the white patch, or the clear glass area can accidentally sublimate during heating.

Stainless Steel Mini Tumblers are another option. These are double-walled, coated for sublimation, and come in 3 oz sizes perfect for spirits or espresso shots.

The Tricky Part: Getting It Right

Small cups come with small challenges.

Pressure is everything. Most mug presses are designed for 11-15 oz cups. The pressure settings for a tiny 3 oz cup can feel different. Some users report that attachments can feel “very tight” when pressing smaller sizes. You might need to experiment with your pressure settings.

Heat distribution matters. Smaller cups heat up faster than larger ones. If you use the same temperature and time settings as a standard mug, you might overcook your tiny cup. Always start with the manufacturer’s recommended settings and adjust from there.

Design sizing is finicky. The printable area on a 3 oz cup is small. Like, really small. Your design needs to be scaled perfectly. Most suppliers include free wrap templates—use them. One wrong measurement and your beautiful logo wraps around the cup looking like a bad tattoo.

Is This Worth Your Time?

If you’re a coffee shop owner wanting branded espresso cups, absolutely. If you run a bar and want custom shot glasses for a special event, yes. If you’re a print shop looking to offer a new product line to existing customers, it’s a smart add-on.

But if you’re a hobbyist who just wants to make a few funny shot glasses for a friend’s birthday, maybe stick with standard mugs. The learning curve on tiny cups is real.

The bottom line? Yes, 3 oz cup heat presses exist. Yes, you can sublimate onto espresso cups and shot glasses. And yes, there’s a growing market for it. Just know what you’re getting into before you buy, and always test before you commit to a big order.