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First 3d printed prototype of the wheel adapter is here. Now a 12mm rod with thread will be glued in, and tested. If all goes well, mass production can commence. I will keep you updated.
Are these 3D printed prototypes resistant enough for the demanding purposes, like an axle hub that may to rotate at high speed and absorb considerable shock?
I had the idea that such 3D printings were very fragile.
They are very solid.
Maybe there are by now different technologies of 3D Printers, using materials with different characteristics.