UltraPrint-Molding PAH10 (Black) High-Temp & Rigid Resin

It's expensive, but this resin is impressive, it's the best resin I've worked with in terms of hardness, curing performance, and overall quality. It's truly impressive.

Good for functional parts

Very tough, but more on the brittle end (snapping rather than deforming when over strained).

Smooth surface, sharp details, and the resin feels extremely tough. Also easy to sand, drill and tap. No visible layers lines at 50um layer height, except on very curved surfaces.