I have a new issue. The Z-axis stepper motor gets extremely hot. After a few dozen minutes of printing, the bottom of the motor becomes so hot that I can’t touch it with my hand.
I tried adjusting the voltage, and also tested both manual and automatic bed leveling, but neither solved the problem. Lowering the voltage to 0.7 and using Z-hop (spiral lift) helps a little, but not much. However, when the Z-axis moves quickly, such as during the homing process, it makes a very loud noise.
I’d like to know if there are any other settings that can help reduce this overheating. It feels like the temperature is beyond a normal level, so something must be wrong. For example, could it be related to the alignment of the printer frame (leveling or vertical alignment)?
I’m already planning to install heatsinks and a fan.
What’s strange is that the Y-axis motor also overheated at the beginning. After I lowered the voltage slightly, it became fine. In theory, the Y-axis should have a heavier workload, right?
No. The Z motors have to have significant hold current to ensure the gantry doesn’t drop between moves. Turn off your printer and push down on the gantry until it moves.
I don’t have the same printer. On my SV07 both Z motors get very warm.
I was trying to explain why the Z motors get hot without lots of movement. They have to constantly HOLD the Z screws from turning to maintain the Z height.
The temperature had risen far too high, reaching over 80 °C, measured with an infrared thermometer gun.
I exchanged emails with SOVOL, who confirmed that the default current/voltage setting is 0.7. It seems that on my machine this value was set to 1.0 or 1.1.
I therefore corrected the value and set the current properly. I also added an aluminum heatsink with a 4 cm cooling fan.
I can now touch both motors with my hand; they are only slightly warm, so I think everything is back to normal.