Took the head from http://www.thingiverse.com/thing:83942. Filled the opening for the connector pin, then opened the center leaving a 1/4" around edges, and
...さらに表示 1/2" on bottom to make a simple Pen holder. Demitions 4'x4'x4
Edit it online https://tinkercad.com/things/gXdx14tfizy
