I was inspired by the 3D Printing Professor's first 3D Block Zoo entry:
Of course, I wanted to do them in FreeCAD instead of Tinkercad.
I would suggest printing with supports, 10% infill, 0.2 mm layer height.
I am using the new version of NetFabb to check my designs. I'm not sure
that they all needed to be repaired, but I checked the automatic repair
option for loading the files. Thus, they all have the (repaired) after
them, just in case.
If you are interested in 3D Printing, please check out my website: