[Solved] Unload filament after print  

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mcgybeer
(@mcgybeer)
New Member

Hi all,

I want to automate the filament unload after a print, adding some gcode lines. For sure I'm not the only one who changes the filament for every print, right? I've done this before for my Ender 5, but I've read that unloading the Mini can be a bit tricky and I don't want to mess it up (it just arrived a couple of days ago). Does anyone know the unload sequence on the latest firmware? I'm trying to replicate the moves and speeds, but probably someone has already done that, or dug into the firmware code.
Thanks!!

Best Answer by mcgybeer:

Well, I've done some reverse engineering and I've got some lines that work, at least for me. Just place these lines in the end gcode, after the "Move print head up" and before "Park print head". They replicate quite well the unload steps and I haven't got any issue so far.

G1 F600 E-30
M0 S5
G1 F4800 E-450

Hope it helps someone! 😉 

Posted : 20/07/2020 8:42 am
mcgybeer
(@mcgybeer)
New Member

Well, I've done some reverse engineering and I've got some lines that work, at least for me. Just place these lines in the end gcode, after the "Move print head up" and before "Park print head". They replicate quite well the unload steps and I haven't got any issue so far.

G1 F600 E-30
M0 S5
G1 F4800 E-450

Hope it helps someone! 😉 

Posted : 22/07/2020 7:50 am
Crawlerin
(@crawlerin)
Prominent Member

Speaking of filament loading and unloading ... if I want longer or shorter PTFE tube from extruder to hotend, will current firmware's loading and unloading routines cope with it or some modification is needed? I.e. if I want experiment with different hotend and it needs Bowden few cms longer or shorter.

Posted : 23/07/2020 3:30 pm
mcgybeer
(@mcgybeer)
New Member

@crawlerin

From what I've seen in the code, the bowden length is written in the firmware and it can't be modified from the menu. That will be a great addition to the settings, so maybe you can suggest it.
Anyway I'm not a programmer, so maybe someone around can help you better 😉  

Posted : 23/07/2020 3:46 pm
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