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How to clean off the nubs from the bed??  

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Rob
 Rob
(@rob-6)
Trusted Member
How to clean off the nubs from the bed??

How are you guys cleaning off the little nubs of filament left from the bed levelling procedure?  

I’m using the satin sheet and love the finish on parts and almost universal filament stick. 

PETG and TPU bits are particularly hard to get off. 

Any tips that won’t ruin the finish on the sheet?

Posted : 01/03/2024 3:51 am
Brian
(@brian-12)
Estimable Member
RE:

Every time.  It'll end up messing up your bed mesh.

Those "nubs" are caused by filament stuck to your nozzle from previous prints. 

I recommend heating your nozzle up to printing temperature for a few minutes before you start and clean it with a brass brush.  Then preheat the printer and as the nozzle drops down to preheat temperature make sure it doesn't ooze anymore.

I do this before every print and it doesn't leave those "nubs".

A plastic scraper or your fingernail work to get them off. 

Posted : 01/03/2024 5:58 am
Diem
 Diem
(@diem)
Illustrious Member

Agreed.  Make sure the filaments are bone dry, the nozzle clean and if you have a problem filament preheat it.  A light plastic scraper will take off any rogues in the few seconds while the nozzles are coming up to temperature but do not apply pressure.

Cheerio.

Posted : 01/03/2024 9:27 am
Brian liked
Acht
 Acht
(@acht)
Trusted Member
RE: How to clean off the nubs from the bed??

I found out it is easiest to do it when Buildplate is cold with your Fingernails.

Works pretty well for me and did it with PLA, PETG, TPU and PC.

Posted : 01/03/2024 3:10 pm
EastMemphis
(@eastmemphis)
Estimable Member
RE:

A note of caution about cleaning the sheet when it's on the bed.

Look at the construction of the bed. Look where it is supported. Now consider what happens when you press down hard to clean off a nub or a stubborn piece of TPU that just won't let go. The heat bed can easily be bent by that pressure.

There should be a note from Prusa stating that the sheet should be removed from the heat bed prior to cleaning. I think that's the smart thing to do since even the slightest bow in the sheet is going to throw it out of tolerance. Every print subsequently made will have that bow too.

Printables: https://www.printables.com/@EastMemphis_905139/models

Posted : 01/03/2024 7:46 pm
EvilleBill, Razor, Sacha and 1 people liked
BaconFase
(@baconfase)
Estimable Member
RE: How to clean off the nubs from the bed??

If a simple wipe to light scrub with ipa doesn't get a nub off I usually just print a single layer square on top of them and peel it all off. Seems to work better than percussive nudging.

 

.Printables.

MK3S MMU2S, XL-5T

Posted : 01/03/2024 11:53 pm
Eef
 Eef
(@eef)
Estimable Member
RE: How to clean off the nubs from the bed??

I have a small glass mirror tile (10 x 10 cm) laying next to the printer (very handy when checking backside of extruder; looking under the printer). 
And use it for fast scraping the plate. The nicely rounded corner do not scratch, but are firm enough to remove every pimple on the plate. 

Posted : 02/03/2024 6:48 am
ssill2
(@ssill2)
Noble Member
RE: How to clean off the nubs from the bed??

I've used my fingernails as well.

You can avoid the nubs all together by editing the printer gcode.  I had the same problem but mostly only with tpu and it irritated the crap out of me.  

You just have to remember to change this when starting a new print job or save off a copy of the printer profile with this change.

In this picture, Change the highlighted 210 to 175 and the problem for flex(tpu) goes away.  you can see handling of other filament types there so adjust those accordingly if you're having trouble with them.  I'd love to get prusa to simply change this 210 to 175 by default since 210 is WAY too hot.

Posted : 02/03/2024 2:29 pm
ssill2
(@ssill2)
Noble Member
RE: How to clean off the nubs from the bed??

I went ahead and opened this issue on github
https://github.com/prusa3d/PrusaSlicer-settings/issues/243

I'm not sure why 210 was chosen for flex, but perhaps they'll be willing to change the default to avoid the nubs/dots.

Posted : 02/03/2024 2:40 pm
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