LEGO technic pen holder

thingiverse

This is a clever device designed to securely attach a pen or other object to LEGO Technic bricks via the mounting holes provided. The pen remains perfectly parallel to the pins at all times. For those who prefer their pens held perpendicular to the pins, an alternative solution can be found at The Tinkering Studio on Thingiverse: http://www.thingiverse.com/thing:1486961. Note that this pen holder requires a 1/4-20 fastener for a set-screw and it's essential to chase the set-screw hole with a 1/4-20 tap before use to ensure proper installation.