I needed something very small to test my retraction/deprime settings so I created these things.Someone suggested I make these square so you can build a tiny metropolis after you are done calibrating your printer. I'm going to design a few more "cityscape" blocks to make this happen.Print and measure then change your settings and print again again and again and again until you get it right.The "circular printer test" is a 20mm disk with a 10mm disk on top then a 5mm disk and another stand alone 5mm disk.The other one is just a tiny arch I created to test filling in top circular holes and retraction.