Belt debris / wear

[Textronics 0]

I just noticed my 3,5 month old UM2 ext is showing some serious debris on the back motors under the belt, i triple checked and the belts move freely and don't rub against anything (as by um2 design). what could be causing this? and what should I do?. Replace the belts?

I am getting some of the stuff in the print too..

The printer has a pretty low amount of print/usage hours.

[Labern 737]

This is quite normal for most users. You don't need to change your belts and can get away with just some regular cleaning. You need to oil the axis's so this can be a good time to clean also.

The wear comes from the pulleys not being aligned up exactly the same. If you are concerned about it you can print some spacers to align all the pulleys so this doesn't happen.

I have thousands of print hours on my machines and have the same issue on one machine and it hasn't caused any issues.