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When you added the relay did you place a diode across the coil pointing at the supply? If you did not put the diode there you will get a high voltage flyback at the top of the MOSFET. At a minimum this will eventually destroy the MOSFET. It can also couple massive noise into the PCB causing any ...

There are a few reasons why the limit switches reveal EMI issues and not the thermistor. 1) Input impedance 2) Current induced 3) System Affect Lets take them in order. The susceptibility of a cable to EMI is related to the impedance of the circuit the cable is feeding. If you are inducing 1mA into ...

Moving the wires away from the endstop wires seems to have fixed the problem. The Cheapskates may be slightly tight. They need a nudge to free fall. The belts are good. I could reduce the current but even at 175 it seemed a bit warm. I suppose I should lower the setting and retake the pictures ...

The heatsinks came with a double sided thermal tape.
This stuck fairly well but it would have helped to clean the drivers with alcohol. There are extra thermal tape squares provided in case you must remove and restick the sinks.

I think I am down to my last major problem. Horizontal Skips. In the attached picture you can see three representative objects. All of them exhibit the problem. In every case they skip AWAY from the Z column. All prints are supplied from the repetier host program running on my Mac. What I have tried ...

The small MOSFET heatsinks previously linked arrived and dropped my peak temperatures 20C. With a 60mm fan blowing into the equipment bay, the max temperature is below 55C. Quite an improvement. The FLIR autoscales the colors. In this picture the white color is 52C. It looks like the old pictures ...

All of my prints so far have been PLA. I am still in the "make a birds nest" phase of 3d printing. My standard settings seem to be 230C layer 1, 205C other layers, 60C bed. These settings stick to glass. To go colder I must use blue tape. The heat in the stepper motor drivers has nothing to do with ...

I have been fighting layers moving over like a stepper is loosing a few steps. The problem seemed to get better if I run a fast fan directly on the stepper controllers. At the suggestion of a friend with another Rostock Max I bumped the currents from 175 to 195 this seemed to help some but the steps ...