Square stacking blocks

Wasn't really sure what to call them.  Saw something similar in a local toy shop, made of wood, but had a ridiculous price.  I figured this was something I could design and print myself.

I recommend printing them in the orientation shown in the Cura screenshot, with supports.  If you don't want supports, the small one can be done flat w/o any support, the others can be done flat with a raft.

The ones showing the stacking were printed at 150% size.  There are a combo of original & bigger prints in the pyramids picture.  If you want to stack tall, you're going to want at least 150%.