Universal Ergon Slingshot
thingiverse
I designed an Ergon slingshot with precisely 9.5mm holes. When using it, I pair it with a round hollow rubber band, measuring 9mm in diameter and sporting a 2mm wall thickness. The bumper is adapted from https://www.thingiverse.com/thing:3070941, modified for repair and scaled up to 120% size. For the bumper, I set the layer height at 0.2mm, opted for support material, and reduced the print speed to 50%. On the other hand, I printed the slingshot with a layer height of 0.3mm and an infill density of 25%, which appeared sufficient for its intended use.
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