Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:2948293.
Feel guilty throwing out those spent K-Cups full of coffee grounds? Would you rather recycle them and use the grounds in your garden?
Made this to extract the coffee grounds easily and efficiently. Fits on a standard wide-mouth mason jar.
A little background... I had tried 2 other models on Thingiverse and they either broke really easily or didn't extract all of the grounds (or both). In addition, they took a lot of effort for each K-Cup processed... so I thought a screw-like device would remove the grounds easily without a lot of effort.
This design works great in PLA as well as PETG (have tested both, pictures above are PETG).
Note that if you use PLA, you must be careful to let used K-Cups cool down before twisting onto the screw and emptying the grounds. The high temperature of freshly extracted grounds will deform PLA. Have not had this happen with PETG.
Hope you find this as useful as I do... happy printing!
UPDATE 06/07/18 I've uploaded new STL models that have better reinforcement under the screw's top. This allows both models to print with no bridging of any kind. For the standalone model, this means no supports or bridging and PETG is much easier to use.
UPDATE 06/11/18 Added left-handed versions for my south-paw brothers and sisters out there.