These were printed at 0.2mm Layer height, 0.6 mm walls on a heated bed at 55°C. At 0.2mm the model prints in 8 layers.

The prints are thin enough to attach to a door with some double sided tape, or can be attached using 3mm (1/8") mounting hardware.

It can either be printed with multi color printer to make the text stand out, or use a sharpie to highlight the test.