Filament clumping and detaching from bed

[Electricfuse 0]

 

How do I prevent this from happening? I can get maybe like half of the first layer printed before it just starts clumping and dragging the rest of the first layer with it. I leveled the bed using a piece of printer paper to where it can pass under the nozzle with very little resistance. 

[GregValiant 1,357]

This can be hard to trouble shoot but there are two things that are usually involved.  The ability of the filament to stick to the bed, and the bed leveling (the nozzle is too high so the initial layer is too high).  (Another thing would be the E-step calibration but you should have done that.)

 

I also level with a piece of paper.  I use parchment paper because it's very thin and nothing sticks to it.  A store receipt will work as well.  You should feel the paper dragging on the bottom of the nozzle when you level.

The bed must be clean so wash it with dish detergent, dry it well and put it back on the printer.  Wipe it down with 90% Isopropyl Alcohol taking care not to get any fingerprints on the build surface.

 

In the Cura advanced settings under "material" is "Initial Layer Flow" and it has three or four sub-settings.  Set them all to 110%.

Do a quick test with a cube or something similar.

If the material still wants to drag then you might have to go to an "adhesion promoter".  I use Aqua-Net Super Hold hairspray for PETG and there are products like Magi-Goo (and others) that can help.

 

One thing I found was that after I had leveled, the print would start and there was the G28 Auto-Home command in the StartUp gcode.  It would home all three axis and my Z would end up not quite where it was when I was leveling.  The fix was to change the G28 in the StartUp to "G28 X Y".  Now I level the bed and start the print but the Z doesn't home again so when the print actually starts everything is where it was during leveling.  I still run my Initial Layer Flow a little heavy at 105% though.

[gr5 2,235]

It sounds like your filament isn't sticking to the bed well enough.  Probably the most common issue.  There are many things you can do but probably the most important is to squish a little more.   Filament sticks better if you squish it into the bed more.  So after your leveling process is done, try moving the bed closer to the nozzle by a bit more.

 

I actually got good at leveling the bed while it prints the skirt.  It's confusing, easy to panic, but if you do it every time for the next 200 prints, you will get good at it until it's just automatic.

 

[Electricfuse 0]

Thanks for the advice, I think it may have just been the parts being too small and not having enough surface area since I tried to just print with a brim and it completed. 

[gr5 2,235]

Please look at the image in this post: https://community.ultimaker.com/topic/14378-2-warping-problem/?do=findComment&comment=150870

Brim helps for sure along with 4 other tricks but squish is so so so important!  By far the most important thing.  I don't do brim - especially on smaller parts.  I use brim only as a last resort for very difficult, high temperature materials.

 

[lele27 0]

 

 

heat the bed to 60 degrees

 

[gr5 translated to english - this part of the forum is english only]