On my delta printer I have linear rails and one of them (rail+block) started squeeking while printing. I have thought about these causes: 1) the rails are not lubricated well enough, they were always lubricated from the outside (grease put on rail) since the instalation about 4 years ago 2) they are wearing out and need replacing.
I have couple questions about both possible causes.
The everlasting question: which lubricant do I use? I have seen many to use grease and many others discouraging from that. If not grease, what else? I have Konkor 101 (might not be available in English) or WD40 as lubricant oils.
Should I remove the block from the rail, clear both and apply new lubricant from the inside (i.e. on the inside of the block, to the steel balls)? Or is from the outside enough? (I supect it is not.)
If the rail and block is failing, which one of them? I mean, most parts are designed that some fail sooner than others because they are easier to replace. Is the block wearing out (because it is more delicate) while the rail is still holding (because it is essentially just a block of metal)? Therefore replacing block could solve the problem?