Re: problems in the testing of engines

You can try to replace the 5V regulator (AMS1117) on the Mega board. You can also just remove the diode D1, but then it will no longer run without USB connection.

Podes tentar substituir o regulador 5V (AMS1117) no Mega. Tambem e possivel so remover o diodo D1, mas entao nao podes utilizar a impressora sem USB.