The Mega2560 contains a trace that can be cut to disable the auto-reset

you can also use ASA+

Revision 2 of the Mega2560 board has a resistor pulling the 8U2 HWB line to ground

Revision 3 of the board has the following new features: 1

Edges: Ground with machined beveled Temperature rating = 500 degrees F (260 C) for maximum continuous operation

460pcs Micro Fit Connector Kit for Wires 3DSUPREME NOZZLE The Mega2560 contains a traceThis Micro Fit Connector Kit consists of a total of 460 parts, all made from high quality components. The kit offers a reliable electrical interface that can ensure stable and safe operation of your 3D Printer. Micro Fit 3 Connector Kit in box * 460pcs * Male Female * 2pin, 3pin, 4pin, 5pin Box with 460 pcs. Total. Micro Fit 3 2p 3p 4p 5p male female connector (4*2*10) crimp terminal (2*190) connector kits