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Z-Axis rise on filament change  

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CosmicVelocity
(@cosmicvelocity)
Active Member
Z-Axis rise on filament change

Hi.

Please do not be angry with me, but a search on the topic in this forums mostly results in hundreds of lines of text concerning version changes in firmware since 20umptee...NOT HELPING!!!! I'm 53 years old and I do not have enough time left on this planet to read through threads and subthreads hoping to find a morsel of info on the topic.

Simple question: how do I prevent the Z-Axis lifting when unloading filament? How do I prevent Z-Axis lifitng when loading filament?

This darn "convenience"-function almosgt any time rams the z-axis home on the top of the gantry after I print something higher than 10cm and want to change filament. I use the MK-3 in the IKEA Lack enclosure. Raising the Z-Axis renders the feeding hole of the extruder almost inaccessible, espacially if it occurs TWICE (on unload and load) in short succession. Only solution so far is to force a new homing of Z, so that the following two Z-Lifts will raise the extroder only half way up the gantry (which is already an awkward position for a filament change in an enclosure) 

Please help, because of this the printer is genuinely endangered of getting hurled out of a window.

-Prusa i3 MK3 single extruder (kit) as intended by author
-Creality CR-10 modded beyond recognizabilitty 😀 Constantly sleep-deprived. General wisecrack of the benign kind. Knows he knows nothing.

Posted : 16/12/2023 10:59 pm
Neophyl
(@neophyl)
Illustrious Member
RE: Z-Axis rise on filament change

You can't easily.  Its built into the firmware of the printer.  To change it you would have to modify the code for the printer and recompile and re-flash it.  Which is not easy and straightforward and sounds like you don't have the life span or interest to learn. 

I have a lack for my Mk3, I don't have a hole, I have a slot.  It makes it much easier to work with filament.  

Posted : 17/12/2023 12:04 am
CosmicVelocity
(@cosmicvelocity)
Active Member
Topic starter answered:
RE: Z-Axis rise on filament change

Thanks for the reply.

"One does not simply walk into Mordor!" 🙂

I'm a medical technician, I know the heart and how to CPR people. That's enough for a lifetime. PHP and a bit of Python seeped in along the way. But that's it.

Feature request it will be then, but I sense a certain reluctance of the dev team cause they are quite fond of that function. The behaviour has not been in the code at the beginning. It crept in after some upgrades. And I foggily remember having asked someone at Prusa about it, but they adamantly refused to change it.

Not even the request for a toggle in some sub-menu was met with enthusiasm.

Thanks for the thought with the slot. I might think about giving it a shot. I have a dry box on the top and feed through a bit of PTFE tube from there.

-Prusa i3 MK3 single extruder (kit) as intended by author
-Creality CR-10 modded beyond recognizabilitty 😀 Constantly sleep-deprived. General wisecrack of the benign kind. Knows he knows nothing.

Posted : 17/12/2023 7:42 pm
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