Just a simple jig for putting the magnet holes in exactly the right place. Adapted from RP Archive's magnet jig.

This one is more optimized for FDM 3D printers. I have not tried it on my resin printer.

Also has files for a extension piece/end cap. So you can chain together as many as you want for larger dungeon tiles.

Designed for 2mm nails. As long as the nail is at least 30~35mm long. Might want to add some CA glue into the holes before hammering in the nails, as the fit isn't going to be the best. You'll probably want to cut the nails off a bit shorter on the extension pieces, as the back wall is a bit thinner

Print oriented like in the picture. I printed it out at 0.3mm layer height and it came out just fine.

Made for squares which are at least 75*75*12.5mm (w*d*h) 12.5 can be rounded to 12 or 13, as long as you always round the same way.