This pen cup is quite large and will most likely hold pens a little too well… (If you have any suggestions or improvements, please feel free to let me know or make a remix!)
Printing:
I haven't had the chance to print mine out yet, so tolerances may be slightly off. I also have no idea how the grill in the front/back will turn out with a .4mm nozzle.
Supports shouldn't be needed for the grill sections, I used the paint-on-supports feature only to get the flat overhangs (as seen in my included .gcode/.m3f files).