Summary
Upcycling of empty Blackwing pencil cases into to pen bags/cases for school, university, office or any other use case.
Description
With this design you can convert your empty Blackwing pencil cases into a pen bag/case. A rubber band holds both parts securely into place when the case is closed and also tie them together while the case is open.
Printing
Material
Rubber band with 2mm diameter
Building
Attach the caps to both elements of the pencil case. I recommend to glue the caps to the case so all peaces stay together while in use. The rubber band will be routed in a circle through both end caps. The tension can be adjusted by the length of the rubber band.