A pen holder I designed for my Pilot G-2 Pens. This should work for most pens under 10.6mm diameter, and can be scaled up for larger pens as well.

My PLEIADES series of prints are designed to be printed in vase/spiral mode in your slicer. I suggest printing with 0.4-0.42 mm nozzle width and 3-5 bottom layers. No top layers. Make sure your slicer is not set to close small gaps. In Bambu Studio I had to lower the 'Slice gap closing radius' to 0.001 mm

Photographed models were printed on the Bambu Lab X1-Carbon 3D Printer using Bambu Lab PETG-CF filament.* *These affiliate links give me a commission on sales at no additional cost to you. Thanks for supporting Make Anything!