had to reply to this one, get rid of polyfuses and install automotive fuses before board and all connectors, the first chinese connector cant even carry 2 amps - i soldered direct to board also use real heat sink epoxy for stepper drivers and heatsinks. I also installed a heatsinks on mosfets. and definitely a 80mm fan cooling ramps at all timesby Collins-delta-bot - Delta Machines
dont know if this will help but i found you cant be running pronterface and arduino ide at same time it interferes with uploadby Collins-delta-bot - Delta Machines