“Now, $70 may sound cheap, but the cost of putting things into production tends to be literally more than the sum of the parts. (That “three months of work” part should tell you something.)
It’s a beautiful project. There’s some messy code and schematics online – not really intended for someone else to try to recreate this, but worth a quick browse if you’re making your own project, like spying on someone else’s workbench.”