After sitting around for months I finally got around to attempting to solder up a board. It was going quite well until I made a complete mess of the qfp-144 stm32f417 which turned into a mess of solder blobs I couldn’t shift. I’m not sure if my iron wasn’t transferring heat properly or I just suck at it, but attempting to drag solder it just didn’t work out - maybe it was because I was using lead free solder but the blob stuck to the first pins and wouldn’t move down as I dragged the iron over it. Anyway I have some breakout boards for smaller parts of a similar pitch on the way and I will try again on those first before trying the led matrix board again