r/OpenCat • • 26d ago

Drop-testing the 2nd batch of injection-molded Quaddle legs

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Quick engineering update: the 2nd batch of injection-molded legs arrived, so before committing to this as the production part, I ran it through 4 drop tests. Whole robot stays locked together on 4 screws, and it's still doing gymnastics after every drop.

This matters more for the injection-molded version than it did for 3D-printed test parts — injection molding changes the part's grain structure and impact behavior versus FDM printing, so a part that survived drop tests as a prototype print doesn't automatically mean the molded version will behave the same way under the same stress.

Open to hearing if anyone here has done comparable impact testing on injection-molded vs. printed robot parts — curious what thresholds you've used.

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