Ender 3: Oldham coupler for Z nut

thingiverse

So this is a remix of mala04's Oldham Coupler. Unlike my other coupler, this one is specifically designed for the Ender 3. This model was based on a design I found of the Ender, and if something needs to be changed, please let me know - mine is still one paycheck away. It fits together like this: C-B-A. The main change made was that I don't like sanding, and neither does my nylon, so I got rid of the outward offset on the parts meant for sanding down to fit. Hopefully, I've saved you some trouble too - though lubrication is still a good idea! I did add an inward offset of 0.1mm for one version of the A and C parts. In prints I've made, a 0.1mm offset produces a tight slide-in fitting, so I added that to this model. There's also a model with no offset. Other minor changes were made to round corners in the XY axis to produce smoother, better-printed parts, and chamfered the base to prevent elephant's feet. I provided a STEP file because working from mesh files is honestly annoying - though I do admit that mala04's was easier to work with than most. It's really clean mesh, gj! Edits: 9/25/18 - I didn't realize how much nylon shrinks. I'm going to continue testing but now have three different A and C files: Negative offset: If your printer isn't top-notch and you want the parts to slide properly. No offset: If your printer has very low Z wobble, and you're printing in ABS/PLA or a low-shrink plastic. Positive offset: If you're printing in nylon or another material that shrinks a lot.