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PLA problem on Prusa Mini  

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andsk8
(@andsk8)
New Member
PLA problem on Prusa Mini

Hi, I'm new to 3d printing. I'm having a problem that I don't know how to fix.

I'm using Amazon Basic PLA to print, Prusa Slicer with that filament preset and printing a lid of a box.

The problem I have, is, that after calibrating the first layer, (with Z square and with the printer first layer calibrating test) and having a good result, in the middle of the print of the first layer of the lid, it starts falling apart. I start the print with a Z-level, and if i stay with that value, somehow, it starts failing in the middle, but when it starts it goes very well. As if the bed in the middle would have a different height, I don't know really. I need some help.

Strange thing is that if I print with PETG or ABS, the problem seems to occur less.

I post a picture, maybe you can throw some ideas.

Thanks a lot

Posted : 19/07/2020 1:41 am
Zane
 Zane
(@zane)
Eminent Member
RE: PLA problem on Prusa Mini

Have you tried the live z adjust while printing to move the nozzle up/down to see if it makes a difference? Its hard to tell if its too close to the bed from that photo, are there any gaps at all?

Is the bed clean, cleaned with IPA? One thing to note, the Amazon PLA I have prints terrible on my mini, Id try printing with another PLA or prusament to rule out the filament.

...
Posted : 29/07/2020 6:46 pm
accounts-1
(@accounts-1)
Active Member
RE: PLA problem on Prusa Mini

If thats the first layer definitely looks like z calibration is too close to the sheet.  But if its the filament then nothing you can do.  if youre looking for an inexpensive filament I used polymax polyfill on the mini and my prints look amazing on both .4 and .25mm nozzles.

Posted : 29/07/2020 9:27 pm
PropRocket
(@proprocket)
Active Member
RE: PLA problem on Prusa Mini

@accounts-1

I agree that this looks like the nozzle is too close to the bed. I would also suggest doing what @thomas-b13 said and perform a live z-adjust. Just be careful to pay attention to the direction you're adjusting the nozzle. In the past I had an instance where I thought I was raising the nozzle but in-fact was lowering it. That mistake badly damaged my smooth PEI sheet and clogged the nozzle. 

I don't think the PLA you are using is an issue. I use Amazon Basic filaments and while they aren't high quality, they are good quality for the price. Although Polymaker Polymax filament is worth buying, at $39.99 for 750g I wouldn't consider it inexpensive. 

Posted : 31/07/2020 12:35 pm
accounts-1
(@accounts-1)
Active Member
RE: PLA problem on Prusa Mini

@ryan-p26

Sorry  I meant Polymaker Polylite.  24.99 for 1kg

Posted : 31/07/2020 4:02 pm
atomleef
(@atomleef)
Estimable Member
RE: PLA problem on Prusa Mini

from image i think first layer is too thin, may be because of nozzle is too close too bed, try calibrate again move you z hight up. pla should thin as that thin. I used to be like that once.

Posted : 03/08/2020 10:46 am
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