This is a simple material stop to be used for example on a milling table with 10 mm T-slots.
Designed to fit with 10 and 6 mm steel rods, M6 heat insert, and a M6-locking screw.
Suitable filament is PETG or similar with some flexibility.
Parts can be printed without support but some cleaning up with a drill might be necessary where bridging occurs.
The author hasn't provided the model origin yet.