Glass beads dispenser
thingiverse
Designed to screw onto a standard 4 mL vial. Using glass beads size 212-300 um, with a target of 20.0 mg, average dispensed weight was of 20.37 mg (SD = 0.26, RSD% = 1.29, N = 10). This did not work well with inorganic bases : (. Printed in PLA, at a resolution of 0.06 mm (0.25 mm nozzle), support touching buildplate only for main body. Sanded interfacing parts for smooth motion and cleaned holes with small torx screw. Assembled with cyanoacrylate glue, two M2 nuts, and a M2 screw and compression spring of appropriate lengths - ideally, you want to select the two so that the hole in the slide plate lines up perfectly when pushing the slide plate through.
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