Header Pin Soldering Jig

thingiverse

Helps keep header pins perpendicular to your PCB when soldering. Some light sanding with a fine file might be necessary, as my printer slightly rounded the inside corners. Might also need to file the depth a bit too to get the header to sit flush with the jig. Not sure exactly on the type/name of the pins (headers are ~2.5mm thick, ~10mm tall), but they came with the prototyping shield for the UNO.