Surface chatter with ABS

I have a TAZ4 and I am having problems with surface chatter. What seems to be happening is that the material is high enough that it hits the nozzle on subsequent passes making a rough surface. This is with ABS at 230c with an 85c bed. This is with the medium profile no support and a .35 nozzle. Any help will be appreciated.

Have you fully enclosed your Taz to trap in heat and prevent cross drafts from cooling part as it prints?

Is your part warping up off of the bed during the printing process? Perhaps not enough ABS/acetone juice?

I have raised my bed temp to 95 degrees, and the people at the shop where we bought our TAZ usually print ABS at 105-110.

I saw this same type of chatter once. That was before we enclosed the printer and raised the bed temp.

I think blasts of cool air during the printing process caused my issues with chatter. People walking up to the printer to watch it print and being in a drafty location.

Also - are you printing with the fan on? For larger flat parts like that I make sure the cooling fan never runs.

Your top surface layer extrusion width is a bit smaller than ideal. Increase the value found in Slic3r at: Print settings > Advanced > Top surface extrusion width

Totally enclosed, even has a sealed port for cooling the board. Also no corner warping, actually bed adhesion is a bit heavy.
gonna try the extrusion width change. probably won’t be able to test for at lest a couple days. Thanks

I’ve seen that happen where the spring tension on the idler arm is too lose coupled with a filliament setting that is set larger than it should be inside of Slic3r filliament settings. It grinds out once or twice at first, packing the hobbed bolt ridges with plastic and then the machine tries to feed more than it can accomodate, but can’t get good enough grip to keep the flow constant. The best fix is to open the idler chamber, clean out any shavings, make sure both bearings still turn freely, replace any that are gummed up, reassemble everything, set the spring tension to the specified distance in the manual, then run the filliament calibration proceedure until you are reliably extruding exactly 10mm worth of filliament every time you tell it to extrude 10mm. It’s a pain in the posterior, and can have multiple causes that all need to be addressed simultaniously.

Major success with changing the top surface extrusion width. Seems like that was the problem. Thanks