Design for manufacturability means you leave tolerance within Factory limits, and your own prototyping process limits.

While an inexpensive PnP machine will do 50k to 80k components/hour. If you have someone doing _any_ task, than add $3 USD * number of operations per unit.

Tech is a low-margin business with a lot of regulations, and should be contracted to a proper facility if making over a few thousand units a month. Tooling up for a production line is almost always a bad idea, as it usually adds additional barriers to a product launch as people get sidetracked. =3