This is a clamping block I designed to join wall sections for model buildings. Use with clamps to hold your items at 90 degrees. In one direction it is a right angle; flip it over and it becomes a left angle.
I printed mine in PLA with 25% infill, 4 perimeters, no supports. You could also use other parameters and materials. The default size is 60mm x 60mm x 60mm with a 6mm thick rib. Rescale to suit your application.
CornerSquareBlock_v01.stl | 4.2KB |