Dust cap for Celestron C6 with Hyperstar

This is intended to be printed "nose down" to get the rim to print cleanly. No supports. PETG recommended.

My physical prints measured a millimeter or two smaller than the digital model was specifying. I assume this was due to material shrinkage and to compensate I had to make the diameter of the model larger than what it nominally should be. What I have uploaded here is what fits perfectly for me, but the shrinkage probably varies from one brand of filament to another. I would suggest printing the rim by itself as a fit test and scale the model in X/Y until you achieve the desired fit before printing the whole thing.