Machine oil on the screws and bike grease on the gears/spooks.
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Just yesterday I managed to calibrate with my new upgrade kit to 4.1 and with firmware .88. I ended the day excited to go to cut today because on a 9x9 grid it gave me a fitness of 0.99 (the best on my maslow).
Today one of the stepper motors on the Z axis (the one below) didnāt want to work, I swapped the connectors and it worked, so it must be the output. Right now it started working and I hope it doesnāt fail in the middle of the cut. 
First edition of text: The stepper motor has stopped working again 
second edition: itās working again, i think iām having problems
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Is this with the board included in the 4.1 upgrade kit?
Yes, this is happening to me so far with the new update board
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Darn, well that is good feedback. I was hoping that the new supplier had fully fixed that issue. Iāll keep tracking it. Iām going to DM you a code for a replacement
How do you know when oil is needed vs a new board?
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The easiest way to check is to swap which motor is plugged into which port. If the problem stays with the port then itās a board thing.
So a board issue is 100% non functioning at that port. IE the motor never turns on one port vs stopping intermittently.
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Unfortunately not 
A bad board can (and often does) work intermittently. I wish that they were 100% bad because then we could catch them more easily in QC testing.
Weāre working with the factory that makes the PCBs to move the QC process there so hopefully they can get quicker feedback about when issues are happening and fix them right away.
I just built mine (full kit). Looks like I have the same issue. Only one of the ports work. I might be able to solder it if thereās a guide.
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I will DM you a code for a free replacement!
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One more here which has the same problem with the full kit 4.1!
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I just completed my Full M4.1 kit and I have the same problem. Iāll wait for Bar to issue me a replacement PCB code.
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My version of the PCB has heat sinks on the chips, is this a new thing? To have any chance of reflowing the solder, then heat sink and any silicone gluing it in place would have to be completely removed, adding to complexity.
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I believe Iām having the same problem with the board, it unreliably moves the stepper.
Also, the first time I retracted the belts, only 3 of the 4 belts moved. Simply hitting retract all again seemed to work for the last belt. Is this the same problem?
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Did I already reply to both of you in emails?
The last email I can find from you is my 4.1 kit tracking number 
You replied to me, thank you. 
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Out of curiosity, does your stepper motor never turn or just sometimes?
My stepper is failing about 1 out of 60 times. Doesnāt sound bad, but if the pieces has a dozen steps, that is a 1 in 5 chance of ruining a piece.
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Mine is failing more like 1 out of 2 or 3 times after booting up, I canāt even realistically get past the very initial setup, because I donāt want to risk it destroying itself by having one of the Z steppers move while the other does not (which bends the whole frame/sled when it happens).
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