When shuffling papers on the desk, I find I can sometimes cover up the pen I'm using. This is a stand that holds the pen at a convenient angle, and hopefully keeps it handy.

This works with most medium sized pens I've tried, whether they have blunt (e.g. Pelikan M800, Sailor Pro Gear) or pointy (e.g. Pilot 823, Diplomat Aero) end. To my surprise, it even holds a TWSBI Vac 700R. The only pen I have found that is too large for the stand is a Visconti Homo-Sapiens, though you might be able to scale the print up for that to work.

I've printed it at 0.2 mm (picture with pen) and 0.3 mm layer heights (picture empty), and recommend 0.2 mm or smaller. Use 10% infill of whatever pattern is pleasing to you. No supports needed.