Grind Smarter: the Easy 3D Printed Espresso Grinder Adapter

If you love making espresso but hate the hassle of transferring coffee grounds into your portafilter, this project is for you. This simple 3D-printed adapter lets you grind directly into your portafilter—no mess, no extra steps, just fresh coffee, fast. In this quick guide, I’ll show you how to make and use this adapter to upgrade your coffee routine. Let’s get started!

Gather Your Materials

What You’ll Need:

1. A handheld coffee grinder
2. A 54mm portafilter (or your specific size)
3. 3D printer or access to one
4. The included files (STL files are at the bottom of this step, Design files are in step 1)
5. Basic tools: screwdriver, calipers (optional for measuring modifications)

IMPORTANT: This specific design uses the Alpaca Grinder from Amazon and the stock 54mm Portafilter from Breville

If you plan on using something different look at step 1.

The design is fully customizable to fit different grinders and portafilter sizes.

1. Measure the diameter of your portafilter and grinder output.
2. Modify the STL files in Fusion 360 (or similar CAD software) to match your setup.
3. Ensure the adapter screws securely onto your grinder and aligns perfectly with your portafilter.

If you need help with the edits, check out the included design notes, leave a comment on the Instructable for tips, or shoot me a message and I'll do my best to help out!

Step 2: Print the Adapter

Load the included STL files into your favorite slicer software and 3D print the adapter. For best results:

1. Use PLA or PETG.
2. Print at 0.2mm layer height.
3. Use at least 30% infill for durability.
4. Support Material is needed

Once printed, check for a snug fit with your grinder and portafilter.

Step 3: Assemble and Enjoy!

Screw the adapter onto your grinder and attach your portafilter to the bottom of the adapter. That’s it! You’re ready to grind directly into your portafilter for a faster, cleaner coffee-making process.

Conclusion

Now you’ve got a simple, efficient way to streamline your espresso routine. Plus, with the included design files, you can tweak this adapter to fit almost any grinder and portafilter. Whether you’re a casual coffee drinker or an espresso fanatic, this project is sure to make your mornings smoother. Enjoy your brew!