Error: Line Number is not Last Line Number+1 when trying to start a new print after one is done. - Hardware, firmware and software help https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/error-line-number-is-not-last-line-number1-when-trying-to-start-a-new-print-after-one-is-done/ Prusa3D Forum Discussion Board en-US Sun, 07 Jun 2026 23:27:25 +0000 wpForo 60 RE: Error: Line Number is not Last Line Number+1 when trying to start a new print after one is done. https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/error-line-number-is-not-last-line-number1-when-trying-to-start-a-new-print-after-one-is-done/#post-673195 Sun, 10 Sep 2023 21:48:04 +0000 Just want to add to this thread that this is a known issue with Pronterface at least since 3.12. For some reason this doesn't happen when using Octoprint.

Relevant Github reports:

]]> Hardware, firmware and software help gudnimg https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/error-line-number-is-not-last-line-number1-when-trying-to-start-a-new-print-after-one-is-done/#post-673195 Error: Line Number is not Last Line Number+1 when trying to start a new print after one is done. https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/error-line-number-is-not-last-line-number1-when-trying-to-start-a-new-print-after-one-is-done/#post-672928 Fri, 08 Sep 2023 18:45:32 +0000 Error:Line is not last Line Number+1

I've had issues with pronterface going bananas and ultimately crashing each time I'm done with a print and want to start a new one because it just goes into an infinite loop of the above serial communication.

I have downgraded the FW version trying to fix it, and it will hopefully work, but using previous firmware versions shouldn't be the solution, so I'm curious of anybody has a solution that would work with FW3.13.1?

]]> Hardware, firmware and software help BertoLaDK https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/error-line-number-is-not-last-line-number1-when-trying-to-start-a-new-print-after-one-is-done/#post-672928