by olawlor, published

Sandstruder by olawlor Jan 23, 2017
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This is a 3D printer extruder for extracting sand, dust, or other granular material from a hopper, and sending it down a Bowden tube under software control. See the OpenSCAD for material details; in particular the steel auger bit needs some modification to fit the stepper in the version.

My blog post giving a bit more background:

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Is this intended to use sand as a support medium for 3D printing?

Yes, my long-term plan is to use sand as both support material and cheap fast infill.

This extruder could be used for filling hopper cars for HO to larger scale model railroads. Nice idea.