My local bagel shop has really just two or three machines they use (plus one human) to make tasty bagels every day.
The Dough Roller
The Conveyor Oven
(Plus one human and a butcher block countertop)
You might also say the sink (which is involved in cleaning) is part of this system.
Could we make an open source reprap style machine that did all of this? Would some of the subsystems of this machine also be necessary subsystems for other possible machines?
The episodes of How It’s Made are super useful.
Do you have other good resources?