even if it's dripping in lube you may still have this problem as I've noticed it occuring at higher print speeds. only the left axis is affected it appears as you've also noticed.
at 150mm/s it's very obvious and I suspect the best solution is to redesign the end caps to have a point which pokes inward, pressing against the rod to remove play.
someone also suggested packing washers or a ball bearing, both of which would be fine if there's room.
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joergen 2
if the system isn't lubricated well, you will hear a faint tock-tock when the rods knock against the caps.
absolutely yes, regularly. I use light machine oil, teflon spray works for others. don't use WD40, it's not a lubricant, and don't use grease. re-oil every time the rods feel dry. you should be able to move the gantry with your little finger.
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