Marlin: [BUG] Marlin crashes with default Cura settings

[ReProgram8a9ce45a]

Description

Marlin crashes when encountering certain g-code created by Cura 4.1

By default, Cura sets a unlimited speed amount for the Z axis ("maximum z speed"), producing this G code
;TYPE:SUPPORT
G1 F17987547480000 Z0.3

When Marlin encounters this it freezes and then the watch dog resets

Steps to Reproduce

Cura 4.1 with defaults settings for Z speed

Additional Information

Marlin 2.0, downloaded on May 24 2019, MKS board with atmel 2560

[2kingsrock]

I opened a bug with the CURA team over this, as I ran into this several weeks ago. I was told that this default value was used by the devs as it is the speed of light. I told them as funny as this is to use as a new default, it is a nonsense value that will cause problems with many machines. The issue is the system is set with a default value of 0 in the software. The callout box says it will default to light speed if a non value is set, or it will use the default in the firmware. However, the system will hang when it parses the G1 F17987547480000 line (basically at any Z hop command) when trying to compare that to the firmware values stored in marlin. The easy fix is to put a value in like 25mm or something reasonable in the slicer. I am not sure it is the same, but is dividing by zero a bug? :) I still think the DEVs for CURA need to change this default to anything, even 99999 would be great 🥇 https://github.com/Ultimaker/Cura/issues/5753 Looks like there has been an updated comment in 4.2 this will be addressed.

[Roxy-3D]

It may be reasonable to re-open #13929 for discussion. In particular... I think vendors have a legitimate need to set various limits for their machines and what has been tested and verified on their platforms.

More in depth thinking here: https://github.com/MarlinFirmware/Marlin/pull/13929#issuecomment-490505972

[InsanityAutomation]

I'll drop in support here, even though it's redundant with my PR mentioned. I'd like to clamp jerk, Accel, junction deviation, and feedrate to sane limits.

[boelle]

Lack of Activity
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issue, please let us know how you solved it. If you haven't, please tell us
what else you've tried in the meantime, and possibly this issue will be
reopened.

[github-actions[bot]]

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