Convert Blackwing pencil case into pen bag/case

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

• I printed in PLA with 0.4 nozzle and 0.2 layer height. 
• The outer face of the cap was facing to the print bed
• You have to print the cap two times

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.