Wiring Pen / Fädelstift

I had to solder a new board prototype with many connections. As i had some thin wire on a roll but no wiring pencil i decided to make one :)
Designed the rollholder and printed it. All left to do after printing is removing the support material, drill a small hole for the wire and find a pencil you can use to put the printed thing on top.
Place the wireroll in the holder and you are ready to go :)