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MarlinFirmware / Marlin

Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine.
https://marlinfw.org
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[FR] Optional Nozzle Clean on Power Loss Recovery #22120

Open qystan opened 3 years ago

qystan commented 3 years ago

Did you test the latest bugfix-2.0.x code?

Updated 14/6: Tested with bugfix, same.

Bug Description

This is running under version 02000801 with NOZZLE_CLEAN_FEATURE enabled. I am not able to test it out under bugfix due to compilation errors (see Issue #22117).

The PLR recovery steps observed:

  1. Nozzle and bed reheats.
  2. Performs an Auto-home.
  3. Performs a linear nozzle clean if NOZZLE_CLEAN_FEATURE is active at nozzle (Z_MIN_POS+1). Does not occur is NOZZLE_CLEAN_FEATURE is not activated.
  4. Continues with object printing.

The problem is with step 3. With PLR, an object is on the bed and will be knocked off by the hot end/housing if it is in the vicinity of the nozzle clean strokes. I have modified the nozzle clean movement to 0 on the X-axis to minimise its intrusion into the bed area and deactivate PLR if the print goes into the cleaning zone

define NOZZLE_CLEAN_START_POINT { { 0, 30, (Z_MIN_POS + 1) } }

define NOZZLE_CLEAN_END_POINT { { 0, 60, (Z_MIN_POS + 1) } }

A safer implementation will be to pause the hotend after homing for the user to perform an manual cleaning and continue after user confirmation.

Also consider a user caution to keep the hotend housing envelope at home location clear when PLR is enabled as there will be homing actions with partial models on the bed. Could be as an added comment in the PLR definition section.

Bug Timeline

Unknown. Only noticed when PLR was triggered recently.

Expected behavior

PLR should not perform nozzle cleaning during restart.

Actual behavior

No response

Steps to Reproduce

  1. Start print. Print must physically commence for PLR to work.
  2. Simulate power failure by switching off supply.
  3. Reinstate power and observe.

Version of Marlin Firmware

2.0 02000801

Printer model

Tronxy XY3

Electronics

Chitu V8-190729

Add-ons

No response

Your Slicer

Cura

Host Software

No response

Additional information & file uploads

2.0 config.zip

ellensp commented 3 years ago

Results on testing on bugfix?

qystan commented 3 years ago

Tested on bugfix, same. Updated issue comment to reflect. Thanks.

thinkyhead commented 3 years ago

Introduced in #18558 by @sjasonsmith, probably because there is a nozzle purge just before the clean. I suppose we can make this optional, so it is not a bug but a feature request.