Prints getting stuck to the nozzle, and coming off the bed
 
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mvarela
(@mvarela)
Active Member
Prints getting stuck to the nozzle, and coming off the bed

Hi! I'm totally new to this hobby, just assembled my Mini+ a couple of days ago. I've had some mixed success with the prints I've tried, some come out pretty much perfect, others just fail consistently. In most of the failures, there seems to be an issue with the print coming loose. I've cleaned the bed with IPA, and with windex, and I've been careful not to touch anything but the borders, but the issue still happens.

Most notably, the perimeter lines that are laid at the beginning of each print tend to come off.

I've tried the test suggested in https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/life-adjust-z-my-way/ and I can get the single-layer squares pretty much perfect, no variations or stuck lines are visible. Likewise, I've tried a V2 calibration script that I found in some other thread, and it consistently comes out perfect.

I've also tried increasing the bed and extruder temperature for the first layer (225/65), and that seems to help somewhat, but I'm still getting the problems.

The last 3 prints I tried ended up with the piece stuck to the nozzle, and artifacts like in the pictures attached.

 

Any suggestions would be appreciated!

Posted : 26/12/2020 6:42 pm
bobstro
(@bobstro)
Illustrious Member
RE: Prints getting stuck to the nozzle, and coming off the bed

Textured, sarin, or smooth PEI sheet? The textured sheet often has poor adhesion with PLA. 

My notes and disclaimers on 3D printing

and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan

Posted : 26/12/2020 6:59 pm
mvarela
(@mvarela)
Active Member
Topic starter answered:
RE: Prints getting stuck to the nozzle, and coming off the bed

I'm using the smooth PEI bed, and Prusament PLA (galaxy black, though I doubt that matters much 🙂 )

Posted : 26/12/2020 7:03 pm
remington
(@remington)
Eminent Member
RE: Prints getting stuck to the nozzle, and coming off the bed

I couldn’t get the galaxy black to print correctly before I ran out of the sample spool, however the other supplied grey sample spool was flawless on the same settings.

you could try tweaking the flow rate up a bit, or printing with a brim to see if that helps?

Posted : 27/12/2020 2:17 pm
mvarela
(@mvarela)
Active Member
Topic starter answered:
RE: Prints getting stuck to the nozzle, and coming off the bed

I washed the PEI sheet with hot water and soap, and also increased the bed temperature a bit more (80C), and added brims.

Today's prints have all come out pretty good, I haven't had the problem repeat so far. I did a few smaller prints earlier, and they were ok. Now I'm doing a larger one (12h or so). It's 1/3rd through and no problems so far, so fingers crossed...

Posted : 27/12/2020 2:22 pm
remington liked
cwbullet
(@cwbullet)
RE: Prints getting stuck to the nozzle, and coming off the bed

@mvarela

There is no reason to increase the temp on your bed.  

If I were a betting man, I would guess you need to adjust your Z offset or live Z.  

--------------------
Chuck H
3D Printer Review Blog

Posted : 28/12/2020 12:59 am
Patric
(@patric)
Active Member
RE: Prints getting stuck to the nozzle, and coming off the bed

The first thing I always do when parts are not sticking anymore is cleaning the heatbed with hot water and dish cleaner. Make sure to clean the cleaner off properly 😉
Step two is checking the first layer hight with the awesome live Z-adjust feature.

This post was modified 2 years ago by Patric
Posted : 28/12/2020 8:36 am
mvarela
(@mvarela)
Active Member
Topic starter answered:
RE: Prints getting stuck to the nozzle, and coming off the bed

@cwbullet

I'll try some prints with lower bed temps again. Yesterday I managed to print good ones with a washed PEI plate and 80C temp. I have checked the live Z calibration, and the first layer tests in this thread https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/life-adjust-z-my-way/ come out perfectly fine. I think it might have been the windex (well, ajax) I had used before to degrease the PEI surface. After washing, things have worked out just fine so far.

Posted : 28/12/2020 8:41 am
John
 John
(@john-6)
Reputable Member
RE: Prints getting stuck to the nozzle, and coming off the bed

I though windex was used to REDUCE bed adhesion for filament like PETG. Happy to be corrected. 

i3 Mk3 [aug 2018]

Posted : 28/12/2020 9:43 am
cwbullet
(@cwbullet)
RE: Prints getting stuck to the nozzle, and coming off the bed

@john-13

You are correct.  Windex will make it less likely to stick.  PETG is more likely to over adhere to the bed if yiou have Z correct.  

--------------------
Chuck H
3D Printer Review Blog

Posted : 28/12/2020 10:55 am
mvarela
(@mvarela)
Active Member
Topic starter answered:
RE: Prints getting stuck to the nozzle, and coming off the bed

Ok, so that was my problem, I was definitely using the wrong stuff! No wonder prints were coming loose...

Posted : 28/12/2020 10:58 am
towlerg
(@towlerg)
Noble Member
RE: Prints getting stuck to the nozzle, and coming off the bed

"I though windex was used to REDUCE bed adhesion for filament like PETG. Happy to be corrected. " You and me both, in this forum I've seen different posts that recommend "stuff" to both increase and decrease  adhesion of the same material (although I suppose it might be possible to increase at high temperatures and decrease at low).

Posted : 28/12/2020 1:00 pm
mvarela liked
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