Listen, I don't own a printer and have never used Solidworks before, so it is very possible that this sucks. Theres a reason I chose that username. I think it looks okay and it is hopefully functional. It is designed so that you can set the pen upright like a normal pen holder, but also so you can lay the pen down sideways in the divot. The hole for the pen is 12 mm. I recommend gluing a piece of felt or something that wont slide to the bottom of the holder so it doesn't slide around and scratch up your desk as well.