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Print w/ ABS cracked using heated bed

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I've been running it without the fan on at all. Could this also be a source of the problem?

Also, i just ran another test and stopped it due to warping and some abs 'booger' buildup in one spot. See the below photo:

2012-10-08_12-47-55_733.jpg

This is on a heated bed, no fan running, running Cura 12.07. Packing density set to .85 and pretty much everything else is default

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This is on a heated bed, no fan running, running Cura 12.07. Packing density set to .85 and pretty much everything else is default

yes, you need some cooling. some light 25% fan should help with the goo, and also lowering the speed might help, to give the ABS a chance to solidify.

In addition, the packing density of 0.85 in Cura is (very) wrong: this leads to severe over-extrusion, and no amount of cooling will help you making a nice print. I would suggest to dial it back to something like 0.96, and then adjust the flow if you think you are still over/under extruding.

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