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I solved the mystery! I was changing the variables (such as lighting conditions, photoresist layer thickness, exposure, developer concentration and temperature) and got different results, from which I was drawing wrong conclusions.
It was my oven all along! I thought I always baked the #photoresist consistently for 10 minutes at 100°C, and yesterday I got those forbidden nachos! That thing was just widely fluctuating the temperature every run! Out of sheer (un)luck, both times I actually measured the temperature, it happened to be correct.
Switched to baking on 3d-printer's heated bed (also component-abuse-chsllenge-vibe) and finally made a perfect #DIY #PCB.
It could be in my project log on #hackaday, but I still didn't get the maker status.
@hackaday does it always take this long to get?
Three completely cooked copper-plated boards covered with blue photoresist. The boards show serious blistering and two even have black burned edges. Result of obviously incorrect temperature control in my oven
#DIY #hackaday #pcb #photoresist @hackaday
in reply to Kauz

Nina Kalinina
glitchsoc - Link to source
Nina Kalinina
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oh! Sounds like you didn't have a thermometer you put in the oven. Now you know that the thermostats on ovens are just "a guidance"
in reply to Nina Kalinina

Kauz
mastodon - Link to source
Kauz
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@nina_kali_nina sure, I'm planning to hack this oven with something like Reflowduino, but firstly I was not expecting THAT deviation, especially not from the same oven between the runs (several hours in between, the oven was completely cold on each start), I don't think the board would charr before 200°C, probably more. And secondly, I'm just flowing with the vibes of the challenge, you know: unmodified [REDACTED] used as magnetic [REDACTED], [REDACTED] from cigarette [REDACTED] as the source of [REDACTED], receipt printer for printing UV-photomask, stuff like that :D
@Nina Kalinina
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