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3D Printer "Filament Out" Detector
High power LED slide projector
Generally and personally, I'd recommend buying or 3d-printing a GuerillaBeam projector (which I happen to produce ;-) ). To answer your question specifically: For a large screen and short distance you need a lens with short focal length (aka. wide angle lens). You can find out which lens best suits your needs by calculating the throw ratio (distance divided by image width) and looking it up in the table here: https://gbeam.de/knowhow/35mm-lenses/#lens-comparison Did this answer your question?
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