Laser pen lens tip
thingiverse
To create a precise line with your laser pen, you'll need to adjust the lens for optimal performance. This special lens is designed specifically for drawing lines rather than concentrated spots. Check out this example of the type of lens I'm referring to: https://www.ebay.com/itm/10pcs-110-Laser-Line-Generator-Lens-f-Laser-Diode-Module-Colophony-Plastic-Lens/111202448570 I've successfully used a similar laser line to illuminate my homemade laser zoetrope: https://www.thingiverse.com/thing:3382627
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