Tupperware (TM) Shape-o pieces
We bought a used Shape-o toy, it came with two crosses and two triangles but the hexagon, ovale and trapeze were missi...ng.
I made the walls thicker than the originals for more strength.
Update: Added the other shapes but I didn't print them.
3d model print parameters
Printed on my Prusa i2 with 3mm ABS filament.
Sliced with Slic3r, 0.3mm layers 100% infill.
I cut the objects in 2 using Slic3r and glued the halves... together with acetone.