I got on another kick of trying to design the perfect 3D printable press fit D shaft coupler.

It needs to be perfect, as error here will show up literally everywhere.

Well, a couple dozen prints later and I still couldn't zero in, so I gave up and added the second bearing block you see here.  It's a better solution really.

Now my stepper is free to wobble to it's hearts content and it won't affect the accuracy of my spooling rod.

In other news, I decided the tape feeder I spent so much time on was just too tall, and started over with a new design.

Basically I took the wish list generated from the forum posts I did, and made that into a feeder.

This one is based on pinch rollers for the cover tape, uses smaller bearings, and uses a pin to advance the tape.

It also includes my Lego (compatible) base plate mounting.  I'm geeked to try it, but I need to be patient.

It's tiny.  9g servo included for scale.  Getting there... needs some detail work yet, like a mechanism to disengage from the tape on pull, but engage on push that doesn't involve dragging the pin across the holes.  I recall one which orbited a pin and did the latter, but I can't seem to find it.