Mat Hofma & Erik Polumbo
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Mat started Mini Materials in 2015. They detail the beginnings of their company in their Starter Story interview: 
Q: How did you get started on Mini Materials?
I was a graphic designer by trade and really wanted to start up my own e-commerce shop. I wanted to learn web design and at least get some business experience under my belt. I had never even thought of starting my own business.
I couldn't think of what to sell until I saw a guy making mini cinder blocks for fun on Reddit. I wanted to buy some, but they weren't for sale. I figured it couldn't be that hard, so I taught myself 3D design in SketchUp and made molds from 3D prints.
I figured throughout the process that I could at least sell enough to break even - since startup costs were under $500 total. The worst that could happen was that I got an education on 3D design, web design, and prototyping.
It ended up working out a little better than that.