Plastic blobs on first layers

Hi guys,

Most on the time, even if the end result is satisfying, the begining of the print is weird : I have blobs of pastic on the first layers. Usually they tend to disapear a few layers later but I think something is going wrong.

Any idea ?

At the begining of the print :


The same print, a few layers later :


Thx

Edited 1 time(s). Last edit at 04/14/2014 05:18AM by LordGG.

It looks like you are overextruding a tiny bit.

When the first layers are solid, there is nowhere for the extra plastic to go, and the nozzle drags around in it. When the inffill starts there is more room for the extra plastic, and you dont see the overextrusion.

It could also be the the hotend that is too close to the bed, this will also put out more plastic than there is room for, but overextrusion is probably more likely.

Hi Ralf,

Those explanations sound good, I will look into that direction

Thank you