Lever-action pen by blackdynamics on Thingiverse.
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More: https://www.thingiverse.com/thing:3829724
Previously:
https://www.homemadetools.net/forum/...709#post133111
https://www.homemadetools.net/forum/...501#post122786
https://www.homemadetools.net/forum/...363#post126977
https://www.homemadetools.net/forum/...518#post122888
https://www.homemadetools.net/forum/...836#post102618
