Inspired by https://www.thingiverse.com/thing:4769678 and made before I knew https://www.thingiverse.com/thing:1612914 existed. Designed in Fusion360 after measuring with digital calipers and a few test prints/fits for dimensions.
USE PETG! PLA will deteriorate quickly with the heat.
Highly recommend 100% infill with 4 perimeters. Infill is tweakable if you really care but I wouldn't print less than 4 perimeters.
You can print without supports, just use a razor blade to trim the hanging material. The bolt head should press fit perfectly into the indent.
The author hasn't provided the model origin yet.