Perfecting the Oldham Coupler

I redesigned the printer end cap with more support for the tabs. I also moved the top layer's corner supports to the very corners, as the nub left after removing the support is much easier to sand down at the corner.

Wavy tabs are a result of z-wobble

These tabs did bend outward still, but not as much. Putting this end cap on was harder though, since the tabs acted like a spring with a stronger spring constant.

I noticed the z-wobble had returned. Since the only thing that had changed was time, I figured the WD-40 I had used to lubricate the oldham coupler had failed. The coupler had quite a bit of friction preventing the plastic disc from sliding, so I decided to reduce this by sanding down the inner edges of the disc. Luckily, I had some 1500 grit sand paper on hand, which, while slow, allowed for much more precise sanding. Many metal friction fits are only 0.004 of an inch; removing too much material causes backlash. After sanding, the plastic disc slid without much force at all, and engaged it's metal counterparts without backlash.

I sanded the inside notches of the blue plastic