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Topic: layer print issues

I'm running an mk9 extruder with SS pla filament. I was printing fine for months and recently I've had layer issues. I printed a gargoyle and the first 100ish layers were fine. As the print got higher it seemed as though some layers were not extruding properly. http://soliforum.com/i/?HG3LcmH.jpg

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Re: layer print issues

anyone have any ideas what would cause this?

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Re: layer print issues

Could be temperature drop. Filament acts as a heatsink and some more so than others. Could be print speed at the temp you are trying to print at. Could be a partial clog. Could be bad filament. Even the best can mess up a batch.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.

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Re: layer print issues

Okay thanks. My fear was that there could be various issues. Looks like I'll have to burn through 1kg of filament to figure this out lol.

5 (edited by barry1685 2015-09-11 13:29:05)

Re: layer print issues

So I monitored the temperature and didn't see any shift in temp. I replaced the nozzle neck and I am receiving a new nozzle today I might try. I lowered speeds and still have the same problems with any model I print. About an inch above the print I start to get lower extrusion amounts and this causes issues with the layer splits. It doesn't make sense that it is happening at a certain point.

Oh yea I calibrated my printer as well. For some reason I feel like the extrusion rate is low. But my s3d settings are a little higher than normal for extrusion rates.

.20 nozzle tip with .38 thickness and 1.10 multiplier
.10 layer height thickness.
15-20% infill
3 shells

I've never had to use a fan with PLA either so maybe layers aren't cooling? But I don't know why I would need a fan now?