1.25" M28x0.6 spacers for telescope

thingiverse

These are extender tubes/spacers for a 1.25" M28x0.6 threaded optical path for telescope camera's. I use it to set my 0.5x reducer at the correct back focus for an ASI178MC coupled to my Celestron Evolution 6. The plastic threads are a bit weaker than the metal, so you can force them in if the fit is not perfect. User your highest print resolution to get the threads out. 100micron worked fine for me. There are 4 sizes: 5mm, 10mm, 20mm, 30mm.