RE: How to remove the linear Bearings?
A Misumi engineer I was chatting with years ago said something that made me chuckle: "Even motor oil is better than no lubrication, though I always use grease."
RE:
ps: The LMU8UU bearings on the Prusa store page have a statement the bearings are prelubricated. I seriously doubt that claim. Prusa has made that claim before and proven to be wrong, where they thought the anti-rust was a lubricating oil. Until the bearings have a datasheet explaining the packing method used for said "lubricant" it is highly recommended the bearings you place in your printer be cleaned and packed with suitable grease.
You doubt that Prusa pre-lubricated the bearings themselves before shipping them to customers? You should inform them of this. Perhaps create a comment in the assembly instructions for the benefit of others.
RE: How to remove the linear Bearings?
A Misumi engineer I was chatting with years ago said something that made me chuckle: "Even motor oil is better than no lubrication, though I always use grease."
That's a nice anecdote. But I had expected a response more along the lines of "Oops, I was wrong -- seems that Prusa has indeed given very specific instructions to lubricate bearings that did not come pre-greased. And that they never claimed to receive pre-greased bearings from Misumi, but stated that they greased them in-house."
RE: How to remove the linear Bearings?
When building my Core One kit i noticed one of the lineair bearings was making a grinding noise on the rod and was feeling heavy to push, and was giving resistance when the rod was rotated in the bearing.
I thought the bearing was shot, but when i pressed it out of the black aluminium holder the bearing operated smoothly on the rod.
Turned out the machined black aluminium holder bore was a bit too small, compressing the bearing when pressed into. I used a fine coarse emerald paper on a round stick in a drill to evenly remove 0.01 or 0.02 mm of the bore.
Works perfect now.
Just an issue of not meeting fabrication tolerances i guess.