This is a simple remix (addition) to the amazing design by Droopas. The only addition is a small bumper that sits inside one end of the pencil case with an indentation for the nib.
This ensures the nib has nice added protection and also prevents movement of the pencil within the case.
Any TPU / TPE
Print in a rubber material such as TPU or TPE to give a nice cushion in the nib end of the case.
Depending on the tolerances of your printer you will either have a nice tight fitting bumper that needs to be pushed into the end of the case (DO NOT use the pencil to push the bumper in) or add a small drop of superglue prior to insertion.