I remixed an excellent design that I thought was a little wobbly, I printed in PETG with a 4mm nozzle, 45% infill, and 6 walls with the top of the model printed flat down on the bed and they're holding up fine after a few weeks. Lazily modeled in the slicer, I'm calling the artifacts in the tooth section cross bracing. Beveled, not filleted, use a deburring tool for post processing.