The printer does not retract the filament for some travel moves result in scrape printing part as shown in picture.

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This is my printer setting. Not sure which part be the problem.

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I want my printer to retract the filament as I have set it to. Where to check and what could be the problem?

  • $\begingroup$ What is meant by "result in scrape printing part"? $\endgroup$
    – 0scar
    Jan 15, 2021 at 13:42
  • $\begingroup$ The nozzle do rapid move and hit under layer. Sometimes the build plate shifted or the part popped out from bed. $\endgroup$
    – M lab
    Jan 15, 2021 at 16:23

1 Answer 1


Minimum Travel after Retraction is exactly what it says on the tin: if the travel after a retraction would be less than 2 mm, it does not retract. You'll want that to be short, but not 0, because retraction can lead to under extrusion at the start of a new line, and every swap from one shell to the next shell right next to it is classed as travel.

  • $\begingroup$ I think so but you see somw travwl got very long distant but it still not retract which so confusing. $\endgroup$
    – M lab
    Jan 16, 2021 at 0:48
  • $\begingroup$ Set it to line width and see what happens? $\endgroup$
    – Trish
    Jan 16, 2021 at 9:47
  • $\begingroup$ 0.4 or slightly over should work fine. $\endgroup$ Jan 17, 2021 at 5:25
  • $\begingroup$ Retraction does not cause underextrusion though; rather it's necessary to prevent it. $\endgroup$ Jan 17, 2021 at 5:26
  • $\begingroup$ Okay then any way to make 3d printer just lift the nozzle up with no retraction? $\endgroup$
    – M lab
    Jan 18, 2021 at 13:48

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