Also, which MOSFET is being used to drive the heaters on yout PCB? Current wisdom is that IRLB8743PBF or for extreme cases IRLB3036PBF be used, and the schematic I looked at on RepRap spec'd out STP55NF with a higher RDSon, plus if a non-Logic Level part was used by accident, that'll make it even worse. The IRLB8743 works nicely with about 3mOhm vs 15mOhm resistance when on and with high current stuff (IRLB3036 costs moire bit is rated for a full 60V & RDSon of about 2mOhm).
Simpe quesdtion, Do you have insulation on the bottomside of the heatbed? Some people make the mistake of ignoring that and loose a lot of head down.
I do agree, most of your problem is probably PSU & wiring.
Just trying to think outside of the box on other things that might have been overlooked.
Simpe quesdtion, Do you have insulation on the bottomside of the heatbed? Some people make the mistake of ignoring that and loose a lot of head down.
I do agree, most of your problem is probably PSU & wiring.
Just trying to think outside of the box on other things that might have been overlooked.