I've had my Folger Tech Prusa i3 for about two weeks now. I got PLA calibrated pretty well, but I wanted the capability to vapor smooth my parts, so I got some ABS.

I've had a lot of difficulty trying to get ABS to print reliably.

The attached pictures show the problems I'm having. The 20mm calibration cubes have a diagonally oriented texture on the surface. The waviness can be seen on the cube's right corner as shown.

http://i.imgur.com/u1ZWqls.jpg

The same thing happens on all printed parts, but it's more prominent on curved surfaces like in the next picture.

http://i.imgur.com/QqMzYEC.jpg

I've tried changing a huge range of settings and nothing seems to help at all. It looked to me like too much plastic is being extruded which is causing the layers to be laid like a sine wave, but adjusting the flow rate and/or feed rate haven't seemed to change it much.

Does anyone have any advice?