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How do I fix these test prints ?  

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tigertrainer
(@tigertrainer)
Active Member
How do I fix these test prints ?

This is what happened after failed update. Among the MMU2s problems were failure to home lots of bad noises.I have the screws in maybe two threads so definitely not too tight.  All was working perfectly before. Belts seem fine . Using a steel nozzle but that should not be a problem.I went back to older firmware and had to mess with a few things and it made a few good prints then went bad again. Changed to new firmware again and tried these. New polymaker filament just opened. What adjustments are needed ?

Posted : 11/02/2024 8:23 pm
Diem
 Diem
(@diem)
Illustrious Member

How are you drying your filaments?

Cheerio,

Posted : 12/02/2024 4:36 am
Robin
(@robin)
Prominent Member
RE:

Usual suspects besides damp filament: high drag in MMU setup, extruder idler tension, extruder gears, debris in extruder PTFE, (partially) clogged, worn out or damaged nozzle.

It’s usually the last thing you check, so you should make a list, plan an order, wait a second, start in the reverse order and randomly change the remaining order to increase you chance of finding the problem before the last thing you plan to check (works in about half the cases)…

if you suspect the update to have screwed things up: revert to the old version.

This post was modified 3 weeks ago 2 times by Robin

If at first you don't succeed, skydiving is not for you.

Posted : 12/02/2024 10:00 am
tigertrainer
(@tigertrainer)
Active Member
Topic starter answered:
RE: How do I fix these test prints ?

I just opened this filament . It was sealed with large pouch of dessicant .

Posted : 12/02/2024 10:17 am
tigertrainer
(@tigertrainer)
Active Member
Topic starter answered:
RE: How do I fix these test prints ?

New filament ,MMU screws only two threads catching , no spring tension is the only way to make it move filament without grinding or clunking. Playing with the extruder idler tension . Gears looked clean .Rebuilt the hotend with new nozzle (steel) , heater, thermistor , heat block , heat break , and all looked clear to me .

The thing that gets me is it was working great right before update and after it just went south in a hurry. I didn't do any mechanical changes before update . The MMU screws were always able to get some good spring tension and work great . Now I can't put more than two threads in to barely hold it on and no spring tension . I took it off and checked it over and can see nothing wrong which is what I expected considering the above. Thanks for reply

Posted : 12/02/2024 10:41 am
Robin
(@robin)
Prominent Member
RE: How do I fix these test prints ?

Just to be clear, you rebuild the complete hot end and everything was fine, you printed with the new hot end for a while without problems and THEN you updated your firmware and things went south or is the rebuild included in "the update" and you where printing fine before that?

If at first you don't succeed, skydiving is not for you.

Posted : 12/02/2024 10:55 am
tigertrainer
(@tigertrainer)
Active Member
Topic starter answered:
RE: How do I fix these test prints ?

no I rebuilt after the update failed while checking everything

Posted : 12/02/2024 12:33 pm
Robin
(@robin)
Prominent Member
RE:

ok. So your printer worked fine (really, no problems at all?), then you upgraded your firmware (from where to where?), then your problem started (do you have a picture of prints from that stage? Did it start right away or did you successfully print something at this stage?), then you started checking everything and while at it you decided to rebuild your hot end. Any prints after that? Any improvement? Then you changed back the firmware (to where?), did that change anything? and then forth to the new firmware again? Changes?

If I read your first print correctly you did print sucessfully after the rebuild and with the new firmware - so your problems might not be related to the update and the rebuild at all. This all gets back to damp/bad filament (new does not necessarly mean dry) or (partially) clogged nozzle.

If at first you don't succeed, skydiving is not for you.

Posted : 12/02/2024 12:48 pm
tigertrainer
(@tigertrainer)
Active Member
Topic starter answered:
RE: How do I fix these test prints ?

Yes it worked fine . Went from 3.13.1 to 3.13.2 these were just before . After upgrade I haven't gotten anything good.Nothing after rebuild . Went back one then two updates to 3.13.0 . Back to last release . Nothing right since. I will crank up the heat and poke nozzle a bit

Posted : 12/02/2024 1:11 pm
tigertrainer
(@tigertrainer)
Active Member
Topic starter answered:
RE: How do I fix these test prints ?

Adjusted x belt a little . I have readings of 230 -x and 283- y . Cannot loosen belt enough to get around 260 . I have only tightened them once and they were within specs before. Anyway after doing that I printed an xyz cube  picture attached. Z is great xy not so much.

Posted : 12/02/2024 4:03 pm
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