path planner allows user to set the desired movement speed to 0 and then crashes on the next move calculation

[raabomat]

SerialError.zip

With the attached gcode and redeem config (Umikaze 2.2.1-RC2) i get a serial error. Terminal log:

Changing monitoring state from "Operational" to "Printing from SD" Send: M23 /lcl/ae10_3dbenchy.gcodeRecv: File opened:/usr/share/models/AE10_3DBenchy.gcode Size:4786997 Recv: File selected[...] Send: M24[...] Recv: ok : M24 in progress[...] Recv: End stop Y1 hit![...] Recv: End stop X1 hit! Recv: End stop Y1 hit! Recv: End stop X1 hit![...] Recv: End stop Z1 hit![...] Recv: End stop Z1 hit![...] Unexpected error while writing to serial port: SerialException: 'write failed: [Errno 5] Input/output error' @ comm.py:_do_send_without_checksum:3228Please see https://faq.octoprint.org/serialerror for possible reasons of this.Unexpected error while reading serial port, please consult octoprint.log for details: SerialException: 'read failed: [Errno 5] Input/output error' @ comm.py:_readline:2605Please see https://faq.octoprint.org/serialerror for possible reasons of this.Connection closed, closing down monitorChanging monitoring state from "Printing from SD" to "Offline (Error: SerialException: 'read failed: [Errno 5] Input/output error' @ comm.py:_readline:2605)"Closing down send loop

[ThatWileyGuy]

Looks like a crash in the path planner. I'm debugging it.

You might want to look into your start script, though - G1 Z15.0 F{travel_speed} ;move the platform down 15mm doesn't seem to be what you wanted :)

[ThatWileyGuy]

Actually, looks like that's the entire issue - that line is managing to set the move speed to 0 and then try to move the Z axis, and the path planner gets upset because the move will take infinitely long.

There are actually two of these - you'll want to fix both.

G1 Z15.0 F{travel_speed} ;move the platform down 15mm
G92 E0                  ;zero the extruded length
G1 F200 E3              ;extrude 3mm of feed stock
G92 E0                  ;zero the extruded length again
G1 F{travel_speed}

[ThatWileyGuy]

Retitling the issue because it's a bug we'll want to address...