Here's my take on the painter's pyramid. I've designed it in three sizes, measured by the long edge of the triangle. The design is meant to be 3D printer friendly such that you should not need supports to print this.

Update: I printed 6 of the 90mm sized version (shown in cover photo) with no supports successfully.

Comment if you have suggestions or would like to see a variant of this file.

Print instructions

I printed with this in ABS with 4 perimeter layers at 25% infill.