This is designed to be printed with 0.42mm line width! If you are using 0.4mm nozzle, then 0.42 is coming out great and making strong prints!
Also included is 3mf -file, so you can open this in Microsoft 3D Builder and easily change wall locations, numering and screw hole locations.
Holes are set for Biltema pegboard, put you can screw this to any surface, holes are 5mm in size.
Put line width to 0.42mm. Use 4 walls, 4 bottom layers and 4 top layers. There are very small overhangs on lettering, but you don't need supports if you have cooling fan on. This uses 55m of filament.