I started making this for my foster kid who loves these things and I wanted to make her some different/multi colored ones. The other Mega Bloks I found had some issues with thin walls and I wanted more sizes.
The ones I came up with could be refined a bit more by having thinner center walls and removing the bump in between each post but I decided it was good enough for me as they seem to be kid proof and my kid will be able to build higher towers. I have included rectangular sizes from 1x1 through 6x6.
I printed my first ones out of PETG and they are nearly indestructible. I don't use supports and the insides aren't perfect but no one cares about the insides as long as they look good on the outside and they go together.
I included the Fusion 360 save if you want to make your own pattern or bigger blocks. With the rectangular pattern tool set each one 31.5mm apart.
The author marked this model as their own original creation.