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Worked great and then not so great...  

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michael.r73
(@michael-r73)
Active Member
Worked great and then not so great...

I got my printer a couple weeks ago and it printed like a champ. Today I printed some parts successfully, then on the next print it started showing inconsistencies. Not the typical stringing you see, no bed adhesive issues, just "blotches" of extrusion (note the visible darker colors).

I reran the setup wizard about 5 times, tried all the troubleshooting steps in the YouTube videos, checked every bolt and alignment, but is continues. I even checked the consistency of the included Prusa PLA which was just fine. Anyone have any ideas?

i3 MK3 kit running latest FW

Posted : 03/08/2018 3:06 am
thrawn86
(@thrawn86)
Honorable Member
Re: Worked great and then not so great...

I'd focus on your live Z first, yours is pretty high. Either as a consequence of that or in addition to it your top layers look significantly underextruded.

If you're using slic3r, you may still have the M221 S95 in your start script which probably doesn't help.

Posted : 03/08/2018 7:09 am
michael.r73
(@michael-r73)
Active Member
Topic starter answered:
Re: Worked great and then not so great...

So I went back in and readjusted my z level and it is printing great again-M221 is set to 100. However, I am back to the original problem I was trying to fix when I messed up everything else.

When I print, the bottom layer shows random imperfections. Bed is clean, and seems to affect wider parts. They all printed just fine without changing any slicing settings, and then just started to print like this. Thoughts on this?

Posted : 03/08/2018 3:43 pm
thrawn86
(@thrawn86)
Honorable Member
Re: Worked great and then not so great...

aha, good. those ripples/waves are a consequence of the PINDA probe being far from perfect, the bed not being 100% level, mesh correction being far from perfect, and printing on a glossy bed combined.

they're caused by the nozzle being too low, whether caused by a small high spot in the bed or glitch in the mesh. You can try to tune it out (lower first layer width or using the mesh correction menu) but you can only go so far as the other areas don't start underextruding.

there are hardware options you can look into as well, but for the most part its not really something to worry about unless its bad enough to start affecting bed adhesion or top layer quality in thin parts.

Posted : 03/08/2018 10:33 pm
michael.r73
(@michael-r73)
Active Member
Topic starter answered:
Re: Worked great and then not so great...

Thank you curtis.c2, I will look into it. I just got it so may run it by Support to ensure there is nothing else going on.

Posted : 04/08/2018 2:31 am
michael.r73
(@michael-r73)
Active Member
Topic starter answered:
Re: Worked great and then not so great...


aha, good. those ripples/waves are a consequence of the PINDA probe being far from perfect, the bed not being 100% level, mesh correction being far from perfect, and printing on a glossy bed combined.

they're caused by the nozzle being too low, whether caused by a small high spot in the bed or glitch in the mesh. You can try to tune it out (lower first layer width or using the mesh correction menu) but you can only go so far as the other areas don't start underextruding.

there are hardware options you can look into as well, but for the most part its not really something to worry about unless its bad enough to start affecting bed adhesion or top layer quality in thin parts.

What are the hardware options by chance?

Posted : 04/08/2018 9:29 pm
thrawn86
(@thrawn86)
Honorable Member
Re: Worked great and then not so great...


What are the hardware options by chance?

some folks in the discord server are mounting their bed standoffs onto small springs, letting them slightly adjust bed level in combination with using G80 values and mesh-map plugin for octoprint to visualize the pinda's reported values.

you can check this easily by running G28 and then G80. it should spit out a 7x7 matrix of values letting you know what pinda "sees".

Posted : 09/08/2018 6:31 pm
AbeFM
(@abefm)
Re: Worked great and then not so great...

After playing with the manual leveling a bit, which really helped, I found I was outside the adjustment.

I loosened the y-aixs rails, and pushed one up and one down and retightened and this got me nearly perfect and I was able to software level it out.

I maintain an informal list of San Diego, CA 3D printing enthusiasts. PM me for details. If you include a contact email and I can add you to the informal mailing list....
Posted : 09/08/2018 11:02 pm
michael.r73
(@michael-r73)
Active Member
Topic starter answered:
Re: Worked great and then not so great...

Thank you abraham.m, I might try that too to dial it in.

Posted : 10/08/2018 7:13 pm
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