Laser pen lens tip
thingiverse
This is a tip to set a special lens for a laser pen in order to draw a laser line rather than a spot. That's the kind of lens I'm talking about: https://www.ebay.com/itm/10pcs-110-Laser-Line-Generator-Lens-f-Laser-Diode-Module-Colophony-Plastic-Lens/111202448570 I have used this kind of laser line to light up my laser zoetrope: https://www.thingiverse.com/thing:3382627
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