Focusing Tube Reproduction for Celestron Travelscope 70mm

thingiverse

Focusing tube I made to replace the one on my celestron travelscope 70mm. The original tube is also made of plastic, and the gear rack got stripped rather quickly from times I tried to focus *too much*. The reproduction was made by carefully measuring the original with manual caliper. For the threads I used a thread guage, and for the gears I took pictures, zoomed in and found angles by drawing lines and measuring.. Most of what I learned re: gears&fusion360 was from Antalz on youtube, so many thanks to that guy: https://www.youtube.com/c/antalz This was my first project on Fusion 360 Personal Edition Sliced with Cura 5.1.0 Ender 3 Pro w/ bed leveling/marlin 2.0 unmodified/PLA Temp 218 Important: In cura, y dimension should be 40mm not 38.884 if it is. (disable snap and uniform scaling) If y is 38.884 you can just make x and y scale 102.87% and that will make it the proper size. Also enable "make overhang printable" in experimental settings helps with the inner divider ring. Printing from bottom up with the threads on top seems to work well for me on my Ender 3 Pro. Tested recently and works well. All threads line up, gears mesh, telescope lives again!