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This is a small spider I created in freecad just to see if I could print this small. The legs are 0.4 millimeters wide but the slicer wouldn't recognize the legs so I had to print it at 1.5x scale.
Had to lower the print speed to 10mm/s to have the legs succeed. I also had to scale it up 1.5x to have slicer connect the legs correctly, but that's using 0.4mm nozzle, your mileage may vary.