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Horrible grinding sound coming out of my Go.. :-(

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Hi everyone! Thanks for all the advice on the this forum! Unfortunately I can't find any threads talking about my particular problem.

I was in the middle of a print and my relatively new Go started "grinding", like the motors were struggling. It was really a terrible sound. I killed the power immediately, and did a reset.

During the "first time" wizard, the z axis worked fine, and then the X and Y headed home and as it neared the back corner the noise started again, and I got the X Y limit switch broken message. I don't think it's the limit switch because the noise happened near the center of the bed the first time.

When the machine makes this noise, I can move the head manually back and forth towards me (X axis, right?) but it resists quite a bit when I try to move left and right (Y axis?). It's not nearly as smooth as the back and forth motion, and not what I feel on my larger Ultimaker 2.

The belts seem to be engaged, they don't seem to be slipping, but I just don't know where to start to troubleshoot.

I'm thankful to anyone who can offer assistance.


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From what i understand it's on of the motor that is struggling somehow?

You can probably troubleshoot it by doing this:

Put your head (machine turned off)  to the back, right side make sure it clicks the limit switch (with the rod hitting the switch on the left panel).

The go to maintenance -> Avanced -> Home Head.

Do the same with the head in front right corner, the back sliding block is hitting the limit switch that is on the back panel.

This should identify the motor at least or why it's blocking.

Maybe a video would help if you have the opportunity to shoot one?

Edited by Guest

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My first thoughts:

- Something is scratching the case, as neotko says.

- Or something is stuck between moving parts (slide blocks or wheels) and the case.

- Or the rods and slide bearings are so terribly dry that they can't move at all, and start making a screeching sound. Like in cheap cheap computer fans, with worn-out bearings. But here on a lower frequency. If the rods feel totally dry, try gently lubricating them (but don't pour oil on the rods; do the oil on a tissue, and use that to genlty wipe the rods).

- Or some debris got into a bearing and almost blocks it, or a broken bearing.

- Or a severe mis-alignment if something came loose or if the printer got dropped or hit during transport.

Try borrowing a stethoscope (like doctors use to listen to your breath) to find out where it comes from exactly. Car dealers and repair shops also use this to locate weird engine sounds (I saw one using it on my car once). Or try making one yourself from PVC tubes, it might work.

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This sound very much like a belt is trying to climb off a pulley. This might happen if a shaft is not locked by a pulley at the side where the shaft has to escape the body if you like to remove them. Check that the shafts do not move along shaft, but only can turn. This might happen if one of the pulley is loose on the shaft, the pulley that lock the shaft and preventing the shaft to move out of the hole.

Be especially aware of the shaft with the double pulley.

Just my 5 p.

Good luck.

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Hi everyone! Well, problem solved! As it turns out, there was a manufacturing "defect" / "oops".

Here's what I did. I loosened the drive pulley for the motor, then moved the printhead. It moved fine. That told me it wasn't a pulley problem, or anything in the printhead, etc. That pointed to the motor, so I removed the side panel and removed the motor, and it wouldn't turn easily by hand. My heart sunk because I won't be able to get motors very easily. But I noticed that the wires for the motor were pinned by the motor below:



It seems that when the Go was assembled, this wire got pinned in there by mistake. The wires were beginning to fray:


When I separated the wires, the motor spun freely by hand! So I repaired the wires, and put everything together and now I'm back in action! Two good prints so far and everything looks great!


Thanks for the help everyone!




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