Improved 1.25" Collimation Cap

I took inspiration from @misterT Advanced Telescope Collimation Cap and made my own version of their collimation cap.

Some feedback from their design was that you had to cut the model in the slicer to properly print it and then glue it together. I ran with this feedback and designed the cap and eye cup in two parts that can be attached after printing. The original idea was to glue them together but with my printer's tolerances the finished print fit together with a nice interference fit without glue.

I made the barrel longer since the locking screws in my focuser were a bit further back and I also made the eye cup a little longer.

To get the inside of the cap more visible I also did two filament swaps:
black → white @ layer 22 (4.40mm)
white → black @ layer 26 (5.20mm)