When I purchased my China made Anet A8 printer, it came with the ball bearing style linear bearings for the 8mm guide rods. While pulling parts out of the box and putting them together, I noticed several of the small ball bearings fell out of their respective holders. At the time, I really didn't know what to think of it (ie: were these just extra ball bearings falling out; were they actually needed). I put the printer together anyway and it seems to work okay.
I have noticed while I've been printing, there's a lot of noise during travel of the pieces. I'm not exactly sure where the noise is coming from, but realize it has to be coming from one or more of the bearings. To hopefully fix the issue, I've purchased some Igus Drylin polymer bushings to replace the linear bearings:
My questions are:
- When installing these bushings, should they be completely dry?
- Should I at least clean the rods?
- Are they completely maintenance free?
- Anything else I'm not thinking of to worry about?