"Branches" growing off of the print.  

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Lucas G.
(@aristoshd)
Active Member

I haven't printed a lot since firmware 3.9. Yesterday I have printed some flat parts with small vertical features. I have noticed some imperfections but nothing critical. Today I am printing some microphone holder and I get this. Can someone give me an advice?

Prusa 3.9 no mods. Prusa Slicer 2.2. Prusament PETG JetBlack. Standard setting except variable height and detect thin walls.

It may be the same issue mentioned here: https://github.com/prusa3d/Prusa-Firmware/issues/2674

This topic was modified 5 months ago 2 times by Lucas G.
Posted : 11/06/2020 6:09 pm
Tim
(@tim-m30)
Illustrious Member

Something in your model has an overhang with no support.  The printer extrudes into free air and the dangling extrusion attaches to the next point in the movement where there is something to attach to.  Basically, you can't print into free air: all printing must be done on to something.

It is always wise to get more than one opinion......
Posted : 17/06/2020 2:26 pm
Lucas G. liked
Lucas G.
(@aristoshd)
Active Member

I have forgotten that I posted here. Problem is solved already. Because no one have answered I started to troubleshot myself. The issue was wet PETG. I have put it in the oven for 4 hours and reprint this part. This time came flowless. Thank you.

 

Posted : 17/06/2020 5:23 pm
joan.t
(@joantabb)
Veteran Member Moderator

Thank you for the follow up. 

I don't think anyone knew what the cause was! 

regards Joan

 

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 17/06/2020 7:05 pm
Lucas G. liked
Area51
(@area51)
Honorable Member

I have seen this on some of my prints with PETG and thanks to your investigation, I will try drying the filament the next time.

Have a look at my designs on Thingiverse or on PrusaPrinters ;)...
Posted : 18/06/2020 12:56 am
Lucas G. liked
Olef
 olef
(@olef)
Honorable Member

I too have encountered this randomly. Time to buy a filament dryer then.

Posted : 18/06/2020 7:07 am
Lucas G.
(@aristoshd)
Active Member

If you have a reasonable modern oven I would use that. I have dried 4 rolls together and haven't wasted energy for just one. 
The fans in my oven have taken care of the moist quicker than I would expect.

Posted : 18/06/2020 7:10 am
joan.t
(@joantabb)
Veteran Member Moderator

This works in most electric ovens, but is NOT a Good Idea in Gas Ovens

Gas Ovens control temperature by turning a flame bar, on and off, this is likely to give short term high temperatures, well above the average temperature set on the thermostat. 

these are often hot enough to melt your filament

 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 18/06/2020 10:40 am
Lucas G. liked
Lucas G.
(@aristoshd)
Active Member

Of course I meant electric oven with good thermostat. I thought it is obvious. I would also measure the temperature with more precise tool to learn how accurate it is before putting plastic in.

Posted : 18/06/2020 11:46 am
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