What is happening to this print?

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verersatz
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Joined: Mon Mar 28, 2016 11:50 am

What is happening to this print?

Post by verersatz » Tue Nov 15, 2016 12:07 pm

It looks fine in Cura and should have a completely flat bottom. The first attempt looks scarred up and the second is less so but you can see it's still not printing completely straight lines. I haven't seen this happen to a print before. Between the first and second attempts, I tried restarting a few times but it had trouble extruding filament. Eventually, it worked. I am using 3mm PLA.

First attempt:
20161115_124433.jpg
Second attempt:
November 15, 2016 at 1249PM.jpeg

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piercet
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Re: What is happening to this print?

Post by piercet » Tue Nov 15, 2016 12:10 pm

The fillament didn't adhere to the bed. With PLA that can be caused by oils or residues on the bed (possibly from a hand on the bed while removing a part), improper temperature, nozzle too high, or a couple of other things. when that happens, it lays the fillament down in a straight line, but then lifts in a ripple pattern away from the bed. That can also be caused by a bed or carriage with a very loose bearing setup that needs adjusted. Occasionally you can also see that with an idler arm tension set too low causing the fillament feed to be intermittnat.

verersatz
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Joined: Mon Mar 28, 2016 11:50 am

Re: What is happening to this print?

Post by verersatz » Tue Nov 15, 2016 12:34 pm

Thanks for your reply. I already tried cleaning the bed, and I'm using the same temperature I always do with the same type of filament. What do you think is a reasonable next step?

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piercet
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Re: What is happening to this print?

Post by piercet » Tue Nov 15, 2016 12:49 pm

what process did you use to clean the bed?

Next step would be checking the Idler tension, cleaning the hobbed bolt, making sure your fillament diameter is set properly in Cura, and then possibly mving the nozzle offset setting in cura closer to the bed.

verersatz
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Joined: Mon Mar 28, 2016 11:50 am

Re: What is happening to this print?

Post by verersatz » Tue Nov 15, 2016 1:13 pm

I wiped the bed down with some isopropyl alcohol, which has worked for me in the past. I'll check on the other things you suggested and see if they help.

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DougZ
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Re: What is happening to this print?

Post by DougZ » Sun Nov 20, 2016 11:26 pm

Can't help but notice that it looks like your nozzle may be too close to the print bed. The skirt (and remaining part outline) in the second pic is almost see through. The first pic give the same impression due to the outer perimeter being so shiny a void of any filament lines.
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