I solder hotspots as part of my hobby. I thought I'd made a little solder guide to help people solder LED screens onto jumbospot boards. The fit is tight. Mine is perfect, but your printer may be slightly different than mine. Depending on your printer, you might have to sand the LED box a little. Just put the LED screen in the cutout, put the jumbospot over top with the pins in the holes and bump it against the top rail. The guide will keep the LED screen level and square while you solder it on.
The LED isn't supposed to fit all the way in the hole, but the whole width of the board has to be in there. The rest of the space is for the soldered pins and screen
3D Solutech PLA