[mark] had an interesting idea when looking at all the wiring of a typical 3D printer ... If the hot end thermistor connection goes open circuit, usually no damage occurs but the temperature ...

We’re giving [Callan] the benefit of the doubt here and assuming that he built his remote-controlled Residual Current Device (RDC) tripper for the purpose of testing the safety of the wiring in ...

The PTAB concluded on this basis that Lettich was available as prior art under 35 U.S.C. § 102(e). The Federal Circuit agreed with the PTAB “that a prior art patent or published application ...