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Marco117

Under extrusion only on corners?

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So I'm trying to print parts for my BB8 build and I'm constantly running into the same problem. What seems to be under extrusion is happening only on the left side of a face. I'm assuming it is where I have an inside angle and Cura makes a join. It looks like it is slow at starting the extrusion but I can't exactly tell. The rest of the piece seems fine but it ONLY seems to be on the left side of a face OR immediately after the nozzle does an internal angle. You should be able to see in the photos.

 

I've tried increasing flow

increasing the "retraction prime amount"

increasing or lowering the extruder temperature

decreasing the outer wall speed

rotating the part 45,90,180 degrees

none of these seem to work or will make the print quality worse.

 

Could someone help me out?

 

Here are my current settings...

 

Layer height 0.3mm

Wall thickness 1.2mm

Wall line count 4

Infill 25%

Nozzle temp 220

Build plate 60

Flow 101%

Print speed 55mm/s

Wall speed 45mm/s

Outer wall speed 30mm/s

Print acceleration 300mm/s

Jerk 25mm/s

Retraction on

No supports

 

Thanks

IMG_20180415_161028[1].jpg

IMG_20180415_161048[1].jpg

IMG_20180415_161111[1].jpg

IMG_20180415_161127[1].jpg

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What are all your line widths and what is your nozzle width - this is very important.

 

Also what kind of printer is it?

 

Also are you sure it's 300mm/s/s acceleration? That's very slow.  That alone could explain the problem because it would have to slow down A LOT for the corners and sit there and over extrude then slowly build up back speed and underextrude coming out of the corners.

 

It's probably not this but make sure "retract at layer change" is unchecked.

 

I'm thinking it's probably underextruding everywhere it's just worse on this corner.  I would have the machine extrude exactly 100mm and see how far the filament actually moves and maybe change the steps/mm (in other words calibrate the extruder).

 

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My line widths are all 0.4mm and I'm printing on the original Creality CR10 with 0.4mm nozzle, I changed the acceleration because I thought it was too much, I decreased it in hopes it would spend longer on the corners as it's under-extruding on the corners themselves too, and just after. I tried changing it back to original speed just now and it didn't make a difference.

"retract at layer change" is unticked.

I'll look into calibrating the extruder

 

Thanks

Edited by Marco117

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