I used FCGear Addon for Freecad and Freecad 0.17 to design this 50mm guidescope Focuser.
The goal is to use Rpi Camera module with 1.25" adapter or 1.25" eyepiece or camera on it.
I will try to make a star guiding system with this focuser assembled with a 50mm refractor telescope.
If you have an other tube Diameter you juste have to design an new "Tube Adapter".
Gcode files are for Creality Ender 3 Printer.
You can Slice stl files with Cura for your own printer.
I did not try to print it at this time. I will upload a status if it will be OK.
Freecad Project file is available in download section if you need to custom or modify it for your own equipement.
Updated 26/04/2019 :
Tube and Tube Adapter prints are OK
Gear_Tool diameter augmented to 10mm (4mm before) because old diameter was too weak
Cap and Gear_Box updated to fit with new Gear_Tool dimension.
I continue to print other parts...
Warning : Gear_Tool must be printed with high Filling (80% for better strongness)