melitta mill and brew grinder lock paddle

thingiverse

This is a replacement grinder lock for the Melita Mill and Brew coffee maker. I've owned this coffee maker since 2003 (over 14 years), and really enjoy the flavor of coffee it produces. Everyone who tries it says "wow, that's good coffee". However, the built-in grinder body has two locking levers that broke due to years of use. You can obtain spare parts on eBay, but why not print them?! The basket features two of these locks, so print one first and ensure it works for you before printing a second. To remove the old locks, utilize a flathead screwdriver to pry the old lock out, being cautious not to break the axle nubs that allow the part to pivot into place. Update 11/17/2017 The initial design may warp when printed with PLA due to heat from brewing coffee. I have improved the design so it withstands heat without deforming. It is now a two-part design and should be printed at 100% infill. The plug fits into the paddle after installation in the grinder basket, preventing warping. Instructions Print the paddle at 100% infill Print the plug at 100% infill Clean up the hole to fit the basket's pivots using a drill bit Mount the paddle in the basket with the spring in place Push the plug into the paddle to lock the parts together Brew coffee Download from Thingiverse or access the files here: https://github.com/thrasher/melitta_mill_and_brew Print Settings Printer Brand: Printer: Infill: Notes: My prints were done with all default MakerBot Mini settings except infill, which must be 100% Post-Printing Final Cleanup I used a 1/8 drill bit to expand the holes on either side of the part to match the axle nubs on the grinder body. On the MakerBot Mini, since it prints rafts, I utilized a metal file to cut down the outside surface raft and make it smooth. The hole size for the spring is slightly loose, but it works fine. It required too much trial/error to get exact, so I avoided that by making it slightly large. Gently wedge the part onto the axle nubs on the grinder body and don't forget the spring! Work it back and forth a few times if it's a tight fit. Remove and use a file to cut down the shape further if it's binding. It shouldn't bind at all. How I Designed This I simply copied the existing broken part with a caliper, sketching it into Sketchup.