The after market has to be changed to OEM and then HP should be fine. Mine is a HP Laser Jet P2015dn and with hot transfer it works fine. It also works fine with positivedevelopement then application of green TRF. I strongly advise green trf to protect traces in etchant. That should be looked into during this brother talk as well as OEM ink.
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Re: [Homebrew_PCBs] Brother 420 Laser printer
2017-03-16 by Kevin Byrne