We mess up a lot of prototypes, and this is normal. For eurorack modules I get test plates laser cut from plexi and Pololu has amazing customer service and turnaround time. My typical order is under the $25 minimum so they throw in a bunch of free copies. I’ve considered buying a laser cutter in the past but it’s difficult to rationalize given the quick turnaround here. Check them out if you’re laser cutting/etching anything:
Also, they have the absolute best AVR programmer I’ve ever used, and I’ve used them all:
And it’s under $20.