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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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Dual extruder offset function fails on second and subsequent prints. #2993

Closed bruce356 closed 8 years ago

bruce356 commented 8 years ago

Marlin v1.1.0 RC3 Rambo with GLCD (REPRAP DISCOUNT FULL GRAPHIC SMART CONTROLLER with SD card) using S3D slicer.

Using the left hand hot end/extruder which in my case is tool1 (right hand is tool0) to perform a single extruder print, the part prints in the centre of the bed. (can be printed either with computer usb cable or through SD card the effect is the same). Any subsequent prints are printed 33mm to the left of centre (33mm is the offset between the two hot ends).

If I turn off the printer and re-start between each print then the first print again is centred. I am sure this is a Marlin bug and has nothing to do with the slicer. Regards - bruce

bruce356 commented 8 years ago

Is no one else on planet earth having similar problems with Marlin 1.1.0 RC3? Seems hard to believe that I am the only one Regards - bruce

thinkyhead commented 8 years ago

That's an interesting effect. The offset between extruders shouldn't be applied anyplace without a tool change that actually changes the tool. My guess is that the firmware is getting a T0 command and applying the offset, even though the tool wasn't changed.

jbrazio commented 8 years ago

Could it be related with the relative coordinate system (G90/91/92) ?

thinkyhead commented 8 years ago

@bruce356 When you home the machine, are you setting the home XY position to the position of the right-hand nozzle tip? So, for example, if the right nozzle is at X=33mm, Y=0, when you home to an X-Min endstop and Y-Min endstop, the current position should end up being 33, 0 if you're homing your Tool 0, and it should end up as 0,0 if homing your Tool 1. (I am assuming that you want to be able to print on demand with the left nozzle, which, at left-home, has a position of X=0, but that is optional.) To configure for this, I believe you would need to enable MANUAL_HOME_POSITIONS and set MANUAL_X_HOME_POS to 33 (your default extruder's X position when homed). Then you would set 0 as your X_MIN_POS – the "farthest to the left" that your (should be leftmost) X carriage can move.

With a dual nozzle setup the left nozzle can access farther to the left and the right nozzle can access farther to the right, and I'm not sure how considerate Marlin is about these possibilities. In general, it keeps only a single left limit applicable to the single "current position", but obviously this limit should differ depending on which nozzle is active. Finally, I'm not sure Marlin considers the possibility of Extruder 1 being to the left of Extruder 0.

Anyway, I don't want to get too far ahead of myself. Can you post the output of your M503 command? And can you post the part of your Configuration.h where you set your movement limits and extruder offsets? And can you describe the behavior of doing T0 and T1 commands from Pronterface? Do they move the nozzles? Do they change the XY coordinates? And, what is the shortest GCode you can issue that causes the position to get screwed up?

jbrazio commented 8 years ago

Thank you for your interest making Marlin better and reporting this issue but this topic has been open for a long period of time without any further development. Marlin has been under heavy development for the past couple of months and moving to it's last mile to finish the RC cycle and release Marlin v1.1.0. We suggest you to try out the latest RCBugfix branch and reopening this issue if required.

github-actions[bot] commented 2 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.