RE: 3D Printer Overhaul
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I used to work in steel factory back in the early 2000s. Funny fact for square tubes, are actually made of flat steel sheets, by rolling and pressing into shape and welded together.
If the tube rack are made of steel, I think it has to go down to the machine operator how much they tighten those rollers. If it's being over tighten, the edges will have groves. If not tight, it wouldn't be square enough.
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Those are some serious machines!
I've known that bearing rollers are heavily used in many different types of machinery, but I never would have guessed the catastrophic results that can occur if they aren't tuned just right.
Thanks for sharing the photos, we sure do have some amazing machinery in this word!