Mechanical Linkage Pen
Description
New Version: https://www.thingiverse.com/thing:3829724 ** New version has simplified locking system and single piece body** Mechanically actuated ballpoint pen. It is very addicting to play with, and you'll probably annoy the crap out of your coworkers. You'll get annoyed having to explain to everyone what your writing with! The good news is nobody will know how to use it.
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