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"How often do you need to replace or lubricate the bushings on your inkjet printer? "

Never - it doesn't even have any rod-based bearing. All the printhead is sliding on is a fold of the sheet metal frame, it was already well lubed when i got it. It's a 180
€ Canon printer, and still working well after 10000+ pages.

What type of bronze bushing do you mean? Since there is no BOM available yet, i'm assuming those are non-self-aligning bushings, and i've had a horrible experience with those. I had tried to build a small CNC mill and used bronze bushing
s, but they were binding (as in "blocking any movement") as soon as they were even slightly misaligned. For use with printed parts, i'd suggest at least self-aligning ones (like the ones MBI uses) or, for short-term use, IGUS-style polymer bushings.

For linear ball bearings, i shall re-design the m
ounting parts for the Z and Y rods and post them here. :)