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Project Espresso – The Grinder


The start

Coffee Grinder

Cunill – Brasil

The burrs of the grinder.

The top fixed part of the burr on the left. The burr is fixed onto a thread that fits into the base plate on the right. Turing left or right this fixed part will bring it closer or further from the moving burr essentially setting the grind size. The spring on the bottom right of the photo, that normally has a bit of plastic on top, is what prevents the fixed part from turning on its own during operation.

The moving burr with base plate removed for cleaning. There is a hole on the right where the ground coffee should exit.


  • Grinding timer

Project Processes

Grinding Timer
  1. Rewired the timer as the display and the time adjuster potentiometer came soldered to the PCB.
  2. Made the wiring nice and neat with a bit of tape. Also prepared the trigger button and its wire.
  3. Cut the holes on the grinder for the display, knob and trigger button. Cutting rectangles is harder than it looks.
  4. Connected the wires then glued everything together with a hot glue gun. Sinking the potentiometer was the hardest bit as the threaded part just as long as the width of the plastic.
  5. The end results are pretty good. Practice makes it better.Project-Espresso-6-ElGatoGuiri
  6. From a further view.Project-espresso-10-ElGatoGuiri
  7. Going deeper in the rabbit hole a 3d printer was brought into the game too. Printing a single dose hopper
  8. And a single dose cup.Cunill-3d-prints-3-ElGatoGuiri
  9. It can be used to measure out coffee.Cunill-3d-prints-5-ElGatoGuiri
  10. The rim is designed for to fit for the Saeco Aroma portafilter or more recently the Gaggia La Nera coffee machine’s 58mm portafilter.Cunill-3d-prints-4-ElGatoGuiri
  11. It can also be used as a top to avoid unwanted items falling into grinder when not in use.Cunill-3d-prints-2-ElGatoGuiri
  12. And also to collect to ground coffee.Project-espresso-21-ElGatoGuiri
  13. A custom funnel was also made that attaches to the original plastic rim and metal backplate so the ground coffee can travel straight to the dosing cup. Project-espresso-22-ElGatoGuiri
  14. Further work under process for a better dosing cup holder.Project-espresso-20-ElGatoGuiri
  15. A silicon funnel was added so less ground coffee is left behind. A spring and piece of plastic was also glued to the base so the ground coffee holder can be left collecting the coffee on its own.
  16. Also the funnel was replaced with another more neatly printed. A Millenium Falcon merged top was also created to match with the Darth Vader temper also visible at the Gaggia La Nera coffee machine.