What the hecking heck is wrong with my print settings?

[Ehman]

I’ve attempted printing this print about 5 times with refined settings and cannot for the life of me get it to not end up gobbling all over the place. I’m running a pro2.

First off, I'm printing in ABS at 100% concentric infill. I’ve had many successful prints prior to this object using the same slicer settings, and the same roll of filament. Bed adhesion is perfect. Bed is leveled. Layer height is 0.1. The first layer has the fans turned off, then the fan is on after that. The first 5-10 layers go down flawlessly, then suddenly the printer head starts jumping (moving in a jagged motion and visibly dragging on the surface of the print) causing the bubbling and rough surface you see in the images. Every new layer this gets worse, until it seems to break off the jagged edges and starts running smooth again for a number of layers until the process starts again. You can see this clearly. I don’t understand what starts it in the first place, especially after having many successful (taller) prints with the same slicer settings, with the only difference being that the other files aren’t round.

I regreased the tracks, ensured the filament was dry, checked bed level, etc. Any ideas what could be causing this? I didn’t want to try printing a higher layer height but I may give that a shot.

[a-rick]

This might be related to you using 100% infill, and that it is slightly over extruding. 100% infill is quite difficult to succeed with because it leaves no room for inaccuracies. Especially on parts with larger volumes. Try reducing to at most 80 or 90% and see if it helps.

[Manuel@Raise3D]

printing at 100% infill can work at times, however, that is dependent on the geometry used as most prints that are larger/have large flat surfaces can end up warping and having some print quality issues.

In this case, although 100% infill is being used, I do not believe it is the direct cause of the issue seen. In the images provided, I can spot some areas where there's some carbonized material that may be the result of an improperly installed/adjusted nozzle. This is typically a sign that there is a nozzle leaking material. A leaking nozzle can then lead to extrusion issues and even layer shifts too if the nozzle makes contact with the material that drips onto the print.

Can you confirm if your hotend is leaking any material at the top of the heater block or between the nozzle and the heater block?