Pen lid saver

This is a felt tip pen holder. You push the pens, lid end first, in then when kids take their pen out it leaves the lid behind. This has worked great with my kids. They have now had the same set of pens for 4 months without loosing any pens or lids.
I designed it for crayola pens with a 10.5mm tip, but I've included a customizer.

Print in TPU with whatever setting you would normally use.