I've printed this item two times. The first one didn't work at all, and the second did. I did some minor tweeking, retraction of 6.6mm, retraction speed of 4800 mm/minute. Infill of 24 procent (doesn't matter much I guess) and the print qualitety to high. It took two and a half houw or so instead of one and a half but the result is a functioning v29. I havn't test it out with max pressure just yet, but by less pressure there is a noise. maybe good to mention, the settings as I described did work, but I don't think that they're the optimum settings. My setup is; cr-10 s4 and simplify 3D as slicer.