This is a replacement for the Celestron Zoom Eyepiece 1.25”, model #93230. This is a common eyepiece used in the Library Telescope program. The eye relief is the rubber piece at the end of the eyepiece.
More information on the Library Telescope program can be found at www.librarytelescope.org

Creality

CR-20

No

Yes

I've included a STL for a 41mm support to print in PLA. Instead of printing with support, I stop the printer at layer 25 and them insert this 41mm support piece and then resume printing. This saves time in removing the support and makes it smother.