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Z-axis offset woes

Posted: Wed Nov 28, 2018 5:30 pm
by Athyrio
Some genius zeroed out the z-axis offset on a Taz5, and the firmware has since been upgraded. The printer now tries to print well above the stage.

Unfortunately the current version of the firmware seems to have eliminated from Advanced Settings the ability to check or change the z-axis offset option (probably a good idea). So, I switched to the Cura-based approach as outlined here: https://www.lulzbot.com/learn/tutorials/Z-axis-offset (which, interestingly, doesn't reflect the current firmware)

Sadly, the M851 command from the console returns nothing at all. To make sure it's not my cable or the printer, I checked M501, and got the usual eprom dump. I tried it on a properly functioning Taz5, and same result - M851 returns nothing, while M501 works fine.

Does anyone have any thoughts on how do deal with this, or what may have happened to the ability to read the offset? Has the offset simply been eliminated from these printers? If so, how do I get it printing on the bed? The printer is effectively bricked at this point, unless I want it to print nice random birds nests of filament.

~ Will

Re: Z-axis offset woes

Posted: Wed Nov 28, 2018 9:52 pm
by zachah
The Taz 5 doesn't have any software offsets for you to adjust.

You need to adjust the the Z end-stop trigger adjustment thumbscrew.
3-4b.jpg.600x0_q85.jpg

Re: Z-axis offset woes

Posted: Wed Nov 28, 2018 10:48 pm
by Athyrio
I did that. I bring it to exactly stage level when it's homed. When it prints it does so a mm or two above the stage.

There used to be a z-axis offset in the Taz 5 firmware. It could be reached through Configuration / Advanced Settings (I know because I played with the setting once, and got exactly the behavior I'm seeing now.) The Lulzbot documentation says that it's there, and explains how to change it, but those methods don't seem to work anymore.

Re: Z-axis offset woes

Posted: Thu Nov 29, 2018 5:24 pm
by zachah
It sounds like you just need to adjust that a little bit more.

Is there still room to move the thumbscrew clockwise?

You may also want to start from scratch and re-level the bed completely:
https://www.lulzbot.com/content/taz-bed-leveling
https://www.youtube.com/watch?v=EdB8jbXFfns

Re: Z-axis offset woes

Posted: Sat Dec 01, 2018 8:32 pm
by zamble
I'm having the same problem. Very frustrating. And yes the bed has been leveled. Any solutions?

Re: Z-axis offset woes

Posted: Sat Dec 01, 2018 9:37 pm
by kmanley57
I loaded/installed the latest available Taz 5 single extruder firmware on Thursday and it printed without a problem so far. I did notice there is not a Z Axis offset in the LCD menu for that version(1.1.9.28).

Re: Z-axis offset woes

Posted: Mon Dec 24, 2018 1:49 pm
by zamble
any update or ideas on how to fix this? my taz5 has been running well for years and now this?!?!

Re: Z-axis offset woes

Posted: Mon Dec 24, 2018 2:24 pm
by zamble
wow. do I feel like a glum glum! The right side of my printer was WAY off, as in many mm too high. All better now. good luck!

Re: Z-axis offset woes

Posted: Tue Jan 01, 2019 3:35 pm
by choban
has anyone found a solution to this problem, My printer is printing so close to the bed that no filament is allowed to flow, sure would be nice to be able to change the z offset.

Re: Z-axis offset woes

Posted: Wed Jan 02, 2019 6:47 pm
by zachah
https://www.lulzbot.com/content/taz-bed-leveling

The directions above show how to level the bed from completely from scratch.

Follow the entirety of these directions and your bed will be level and your Z-offset correct