Pretty Sweet. thank you for sharing your design! I added a layer change for some color! The only issues I observed is that the pen isn’t held in place that well. and the bottom layer for the insert is so thin it may stick to your print bed and crack. Be careful removing, let your print cool, and keep your print bed clean. Especially with PETG. I was in a hurry to catch a plane and didn’t let it cool.

good design， thanks~