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SoliForum - 3D Printing Community → Help/Repair/Maintenance → Blobby Perimeters after E3D 0.6mm Install
As you can see in the attached picture, my perimeters are really blobby and burnt in some places. The first layer prints perfectly, but subsequent layers get messed up. Solid fill and hex fill both print fine on all layers. I'm printing at 100 mm/s, with the first layer at 60%. Retraction is 2mm at 70 mm/s. Temp. is 250C/245C. What am I doing wrong?
I just discovered something. I was playing with just extruding over thin air and if I extrude faster than about 300 mm/s, the bead swells in diameter. If I extrude slowly, it comes out at 0.6mm (same as nozzle), but if I speed it up to say 500 mm/s, it swells to over 1mm in diameter! Is this causing the blobbing problem? Do I have to just limit the extrusion speed?
Settings seem ok, other than temp may be a touch high (esp for the wide-bore nozzle)? I get away with about 230C most of the time with an 0.4mm nozzle (albeit only running at c. 60 mm/s), this varies between people (and preference) and your numbers aren't silly.
That said, definitely shouldn't be any burning like that. Have you updated the firmware to reflect the new sensor for the E3D, or did you reuse the old sensor? Is the sensor installed securely?
The free extrusion swelling, and that being different depending on speed is pretty normal: it's called "die swell" - the filastruder peeps on this forum discuss it in great detail. The volume coming out is dependent on the volume going in, so this is probably not a problem for you.
Have you calibrated the steps-per-mm again for the new setup (didn't change much when I put my E3D on), and done a wall-thickness calibration again? Could be a wee bit of overextrusion.
Apologies, lots of questions, but lots of possible causes! 
I just started the print over at a slower speed and so far, it looks like the problem is solved. I think I discovered an upper limit to the volume throughput on the E3D. It didn't seem that fast at first because I used to run at 150 mm/s and never had issues. But that was with a 0.35mm nozzle. Now with the E3D setup, I have a 0.6mm nozzle, 0.75mm width and printing at 0.5mm layer height, the throughput is considerably higher, even at slower movement speed. I will have to experiment to find the exact speed at which the output starts blobbing.
This is a bit of a bummer because I bought the E3D and 0.6mm nozzle so that I could print at insane speeds with low (but good enough) resolution. Now I will have to limit my speed to somewhere around 80mm/s.
SoliForum - 3D Printing Community → Help/Repair/Maintenance → Blobby Perimeters after E3D 0.6mm Install
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