I am printing with the TAZ 6 with the dual extruder v2.
The attached picture describes the problem better than I can. The surfaces in that picture were printed down towards the bed and were resting on HIPS support material. The black material is ABS.
The other side of the part looks fine, but every time I try to print on support material it looks like this.
Often when I have holes in the part like this one there are lots of strings across it as well. I cleaned them off of this part.
The support structure setting I used in Cura 19.12 were the defaults I think.
Structure type: Lines
Overhang angle: 45 deg.
Fill amount: 30%
Distance X/Y mm: 0.7
Distance Z mm: 0.05
I printed at 50mm/s, 240C temp on both nozzles, and 110C on the bed, 0.2 mm layer height, 1mm shell thickness, 50% fill.
I spent a lot of time dialing in the alignment of the two extruders during the setup for the dual head printer, and they are equidistant from the bed.
What settings can I change to get this to stop?