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PCB prototyping is the step before bulk production. There are many manufacturers, who offers PCB prototyping. How to find the most cost-effective PCB manufacturers with high quality and quick turnround?
What are good quality of life additions to a prototype PCB?
I have come across a few nice additions such as:
LEDs for power and micro activity.
Test points at important places in the circuit.
Connecting a spare communication channel to a header.
Are there others that are helpful?
Make available liberal points of 0V and Vcc around the board. Sometimes the placement of cap's is enough but sods law dictates that the ONE signal you want doesn't have a convenient GND nearby, or when you need to add a cockroach mod there isn't a nearby power.
If you are going on to a small production run, consider identifying every net that doesn't naturally connect to an external connector, and connecting it to a pin on a ribbon cable header. This can be a lower budget option than adding test points for a "bed of nails" fixture.