@freemo I own a Printrbot Simple (the original, laser-cut wood version) which has been something of a disappointment. The calibration cubes print great but real-world shapes tend to leave the print head at a slightly different "zero" every time it goes up a level, which manifests as skewing the z-axis. The controller board also has a tendency to fail; in fairness to the manufacturer, they know this and offer a very good deal on a new board if you send in your old one.