The problem of double/misaligned lines

If it’s a toothed belt, you can have the belt stretch as it’s coming into contact with the toothed pulley. If you don’t want to call it backlash, I’m ok with that. In the end, it’s similar, at least.

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  Smith

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  Just recently there was a post where the print was moving inches, literally inches, away and the first reply was “That’s called backlash.” Losing steps is not backlash. Bad USB comms is not backlash. While it may (will) result in backlash, the problem is using the wrong parts. Most CNC controllers have a “backlash compensation” setting that will “remove” backlash by moving the set amount more on reverse moves.

  03-04

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A belt doesn’t move against anything else. It’s directly connected to a pulley. When the pulley moves, the belt moves. Backlash is from threaded drive systems. If you put a nut on a bolt, there’s play between the nut threads and the bolt threads. If you tighten the bolt, the nut is pressed against one side of the bolt. reverse direction and the bolt will spin a little bit before it makes contact with the other side of the nut. That’s backlash. The amount of play before the nut actual moves. Belt drives have no backlash. Any “slop” would be the result of something loose.

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  Smith

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  Belt drives don’t have any backlash.

  02-26

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  AbelreplySmith

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  Can easily check it by turning off bi-directional.

  02-27

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  SmithreplyAbel

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  A belt doesn’t move against anything else. It’s directly connected to a pulley. When the pulley moves, the belt moves. Backlash is from threaded drive systems. If you put a nut on a bolt, there’s play between the nut threads and the bolt threads. If you tighten the bolt, the nut is pressed against one side of the bolt. reverse direction and the bolt will spin a little bit before it makes contact with the other side of the nut. That’s backlash. The amount of play before the nut actual moves. Belt drives have no backlash. Any “slop” would be the result of something loose.

  03-01

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It looks like backlash. Probably a belt issue. You can test this pretty quickly, by turning bi-directional scan off. With it off, there shouldn’t be any visible backlash.

Check the set screws on the pulley to stepper motor conection.