Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:1377987.

This is a simple v block, I designed it for using to saw tubing.

To prevent it sliding around when sawing, the bottom edge has a lip to allow it to locate on the edge of a table or sawhorse etc.

It is surprisingly tough even with 15-20% infill and 3 shells (1.2mm)