
Neje laser engraver focus knob
thingiverse
Setting the laser's focus is significantly simpler when using a larger knob. This design was developed and thoroughly tested on the Neje engraver, a specific model available from Gearbest ([www.gearbest.com](http://www.gearbest.com/3d-printers-3d-printer-kits/pp_343187.html)), but it should accommodate most laser diodes with a 12mm brass knob.
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