It might help some people here too.
Originally shared by Jean-Luc Aufranc
3D printed jig + pogopins to ease flashing of firmware to @ESP8266 based AI light bulbs.
Have tried this. But my board had too small test pads and my printer had a 0.4mm nozzle so was not able to get the resolution i needed.
Best I’ve done so far is to glue some female jumpers together and add pogo pins, so that I don’t have to solder headers to all the Sonoff devices I use.