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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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[BUG] [Bugfix 2.0.x] Printer Ignores Set Acceleration Values When Doing Extrusions #15897

Closed theofficialgman closed 4 years ago

theofficialgman commented 4 years ago

The problem I observe can be seen when doing any movement (x,y, or z) that simultaneously involves using the extruder. Whenever a G1 command is executed that includes E values, the values for acceleration set by M204 P are ignored. To me, it seems that the printer attempts to accelerate as quickly as possible. Printing is also noticeably louder when this occurs. Setting the eeprom and firmware values for acceleration low (as in 500mm/s^2) does not affect this.

Observed on an 8 bit Mega 2560 based arduino board. Marlin-Bugfix-2.0.x 227951a (the most recent as of posting)

Going back to an older (last year) 1.1.9 firmware shows no signs of problems. The last firmware which I was running also had this issue (bugfix-2.0.x built on october 30th)

Edit: By randomly choosing an older firmware, I found a more recent firmware that does not have this bug: bugfix-2.0.x f57ce2b (september 28th). I am thinking the issue could have something to do with the changes made in 438835f @InsanityAutomation and @thinkyhead but I could be wrong

Steps to Reproduce

  1. Start any print and observe intense rattling and rapid movement of the printer which causes missed steps, etc.
  2. For a safer demonstration, startup a print and set the extruder temperature to 0 which will force marlin to interpret any move which includes an extrusion as only a travel move. Immediately when marlin activates the hotend too cold feature and prevents extrusion, the printer follows the acceleration values set in the firmware/eeprom/config. 3.Manually heating up the extruder mid-print reactivates the extruder and moves that involve an extrude have the issue again.

Expected behavior: Printer slows speed change according to set accelerations

Actual behavior: Printer ignores acceleration values for movements that include an extrusion

Additional Information

Purely travel moves function correctly according to their defined acceleration values. The height in Z has no affect on this (it happens at all Z heights). Setting the jerk higher or lower does not stop the problem. I am currently using the classic jerk. I have manual_mesh_bed_leveling enabled I have an i3 style printer

configs.zip

boelle commented 4 years ago

@theofficialgman have you tried to ask for help any of these places?

RepRap.org Marlin Forum Tom's 3D Forums Facebook Group "Marlin Firmware" Facebook Group "Marlin Firmware for 3D Printers" Marlin Configuration on YouTube Marlin Discord server. Join link: https://discord.gg/n5NJ59y

theofficialgman commented 4 years ago

@boelle I was actually leaving this bug report open as reference for #15908 which detailed the same problem as this bug report but was posted after mine and gained more traction for some reason. Problem was solved yesterday and merged into the 2.0.x bugfix branch with commit 0fcd1f4.

github-actions[bot] commented 4 years ago

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.