Ball Pen Refill Holder for FABtotum

grabcad

A compact pen refill holder transforms a 3D printer into a pen plotter. Compatible with FABtotum's tool holder, this design can be adapted for other printers. The base plate holds a spring from a ballpoint pen (17mm long) to prevent the pen from falling through, while another spring (30mm long) with larger lead ensures retention and retracting capabilities. A self-centering green clip secures the pen in place, and blue clips attach the housing to the plate.