Celestron Focus Motor Adapter for pre-2006 C11 (Electronic Focuser)
thingiverse
This is a drop in replacement for the plastic insert of the Celestron Electronic Focus Motor for SCTs that allows it to be used on my older flat back, pre-2006 Celestron C-11 Schmidt Cassegrain Optical Tube Assembly. Under the focuser knob on my specific C-11 is a 19mm brass straight tube so it's nothing complex beyond the retaining screw and lip. Originally was going to print a shim to bring it away from the back of the scope a bit, but found that #6-32 machine screws 1.25" long yield a perfect fit to use the supplied orange aluminum mounting hardware that came with the electronic focuser. Some slight filing may be required to get ride of any little bumps/stringing/residual supports.
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