Hi Jim:

I agree with El Corazon that 3D printing is addictive. I have mine since February, and design with Freecad too. Two month ago I knew nothing on 3D printers.

I have been testing a way to engage the main shaft to the motor. You may need to print a plastic coupling as shown (yellow part is the main shaft and brown part is the new coupling).
I had some slippage problems with the first prototype, but I have redesigned a bigger coupling. Unfortunately I have not tested it due to the COVID-19, as we have to be confined at home.

This way the focuser is not so slow, and the resolution is good enough, in the range of 2 microns/step.





Finally, you cannot manually rotate the focuser, but we'll think about that...

Regards, Javi.

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