The file '4 Miniature Cinder Block Mold 3D Printer Model' is (stl) file type, size is 79.8KB.
This is a 1:12 miniature cinder blocks mold, that I printed in Ninjaflex. The block has 33 x 16,75 x 16,75 mm and the mold 40,2 x 73,7 x 17,5 mm.
You can use quickrete to make, and actually build a lot os stuffs.