Cold extrusion prevention not working

[fotis400]

Just tested it multiple times.

With my extruder cold, I send a command to extrude. The printer echoes that it prevented a cold extrude but it DOES extrude.

[boelle]

Not good... @thinkyhead you think you can spot why this one is happening?

[clefranc]

Potential bug confirmed with #1847

[clefranc]

It's the new e delta calculation https://github.com/MarlinFirmware/Marlin/blob/Development/Marlin/planner.cpp#L508

You need to recalculate the delta after the PREVENT_DANGEROUS_EXTRUDE block https://github.com/MarlinFirmware/Marlin/blob/Development/Marlin/planner.cpp#L510

I've put this on line 526

de = target[E_AXIS] - position[E_AXIS];

[thinkyhead]

Fixed the delta e issue (in the above-linked commit).

[fotis400]

tested and works ok.

[github-actions]

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