Big blob on every layer extrusion and not consistent

[Y2527 0]

Hi there

 

I'm quite new to 3d printing. Starting printing a shape and having real issue with the consistency of the extrusion. The printer prints a big blob on every layer which is very visible. Also as it prints, sometimes there a little gap in the material. 

 

I tried to print a curve shape on the top and it also started coming off leaving a big hole in my print.  I'm using a 0.8 nozzle to print. Any recommendations?

 

Thanks! Yod

 

[Smithy 249]

I think you more than one issue, the blobs in each layer are the z-seam, and should not look that bad. You can control the z-seam, to have it not randomly distributed over the object, but have it always in one place. But then it will still look like bad with a big blob.

 

I guess you print too hot or with too low cooling. So the nozzle oozes during the z-hop and then you get the blob at the beginning of the new layer. You can also play with retraction settings, but printing cooler should help here.

 

The problem on the top is hard to guess, maybe a too big layer height? Is the model hollow?