There is calibration to do, and repositioning of the Z-plane rods. Despite all this I printed (a kind of) PTFE retainer.
The first rafts didn't stick at all. Then they did but the extruder would stop or the print would be fudgy so the nozzle got stuck. Then despair came. And today I managed to complete the thing.
And, well err, it does resemble most of the design ;-)