Bachin 2418/3018 Pen Holder
grabcad
The design was crafted by Oliver Stephan, but I tweaked it slightly and created a pen holder specifically for my CNC engraver (Bachin 2418 or 3018, featuring a 44 mm spindle motor diameter). It securely fits onto the spindle motor holder. The design is tailored for use with Pentel #LR-7D ink cartridges. To assemble, apply a small drop of epoxy to attach the spring guide to the Pentel cartridge. A suitable spring is the McMaster Carr Spring-9434K76 or an equivalent model. STL, STEP, and Fusion 360 files are available.
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