Summary

This is a vixen-style shoe adapter made for the Celestron Nexstar 8SE.
It is very likely that it will fit other telescopes, but it has a curvature that fits the 8" OTA.

Sketchup files are included in the download.

It is a very snug fit, so you may want to heat up the adapter with a blow dryer before attaching the guide scope.
You can also print it a +1% and use a 7 mm hex nut and screw to fasten your guide scope.

I used a 30% infill at standard quality on my Ender3, and it works fine.