[tomstokes]

> That makes a lot of sense to me. One of the reasons I stick mostly with software is that it allows for much quicker iteration.

4-5 day turnaround from OSH park is quite fast. Keep in mind that you usually need to order parts from Digi-Key or another supplier when you finish the design anyway. If you have a mistake on a PCB, it's faster to use a tiny stitch wire than to make a whole new PCB.

On a professional level: You can always buy fast turn PCBs if you need them ASAP, but you'll pay for it. Usually cheaper than paying engineers to fiddle with finicky PCB milling or etching machines, though.

> Obviously what you've done here is just getting started, but it points in a really interesting direction. A 3D printer with swappable heads for plotting and an add-on PCB etching kit should definitely have a market.

Chemical etching is more of a novelty these days. A cheap CNC mill produces much better results without the mess and uncertainty of chemical etching: https://hackaday.com/2018/01/04/guide-why-etch-when-you-can-...

On the professional level, several manufacturers make dedicated PCB mills: https://www.lpkfusa.com/products/pcb_prototyping/machines/ These machines have helpful features to index tools to the surface and align the panels as you flip them over for two-layer designs.

[marcosdumay]

I have extra parts at home, exactly because of this. But I can not order extra PCBs with my future mistakes corrected. So it's either make them myself or try a single design, spot my failure, correct, order a new one, wait a week or two until I have some more free time to mess with it.

Or avoid PCBs completely, what is clearly the best option whenever possible (what is becoming less and less common).

[StavrosK]

To be fair, modern EDA software helps a lot with not making mistakes. If your schematic diagram and tolerance settings are correct, it is pretty hard to get the PCB wrong. Every time I had a problem with one, I had made a mistake in the schematic (and once the fab house mistakenly bridged pads because my tolerances were too tight).

I wholeheartedly recommend KiCAD if you aren't already using it.

[sokoloff]

Digikey, Mouser, and Arrow, for the most part, give me next business day delivery for cheap (often free). From Arrow, I think the minimum is only $50 for "free" overnight shipping.