Um2Go bearings?

[peggyb 143]

Does the UM2go also suffer from faulty bearings?

I get this under extruded layer almost every time at the same spot. If I move the platform by hand, at a certain point you can hear a light gritty sound, as if there is sand in the bearings. When I put the failed prints on the platform the position of the nozzle matches the failed spots.

[SandervG 1,135]

Have you cleaned the threaded axis? checked it for dirt or brims?

Did you use a lubricant on the smooth rods?

[peggyb 143]

The thing is brand-new. Right out of the box, these ridges were there from the start.

There is some blue lubricant on the rods and the threaded rod is greased (factory).

How do I get the rods out? from the top? Is this wise to do?

[SandervG 1,135]

You could use a cloth to clean the threaded rod to remove any dirt that might be in between the threads. By applying the grease and moving it up and down manually a couple of times it should be good.

by the way, do you also feel an edge or friction when moving it up or down manually?

The thicker rods left and right shouldn't need any lubricant, that is why I asked.

Lubricant could even make it tougher to move.

Looking at your prints, I do see what you mean on the 3 left figurines, but on the 2 on the right I don't see the layer.

[peggyb 143]

on the right ones the ridge is a bit higher in the hair, but also around the same spot. the yellow one was to try another filament and rotated 90 degrees.

I did not add any lubricant but there is a blue residue of grease.

I cleaned the rods but this gritty feeling remains at the same spot

[JohnFox 25]

Sounds like quite a common problem. Wipe the two Z pillars to remove any grease or oil. Try powering the build plate up and down a few times and listen for any hold up. Wipe the pillars again, it's best to have them completely oil free.

[peggyb 143]

doing some test prints now. They look already better

The gritty feeling/noise is still there, so it feels like a time bomb, hopefully it will not go off...

[JohnFox 25]

If it is the thread at fault, moving it up and down should gradually smooth out the imperfection. Is there anything visible at all?

Repeated cleaning the pillars will remove any excess grease and help the ball bearings roll as they should.

 

doing some test prints now. They look already better  

The gritty feeling/noise is still there, so it feels like a time bomb, hopefully it will not go off...

 

[peggyb 143]

Good tip! I will clean the rods regularly. Prints look good now.

Next problem: right fan makes so much noise when it is more then 80% on.....

[ultiarjan 1,125]

Print laberns fan holder.. improved print quality and less noise as a bonus.