3D-printing to repair sewing machine

13 days into my 365 Clover Challenge: 

My sewing machine doesn't work as a plastic cog is broken. The repair shop can't order the cog so they can't fix it. But I had an idea: maybe I can 3D-print the cog? I asked an expert who said that'll probably work. So I'll now dig into that and hope it works out 🤞.