[Zabco]

OK, wasn't sure why you were interested in the 4 filament system but have know those who did think that they could greatly increase the speed of printing by going that route. Given the size of some of those pieces, 250mm could decrease the amount of time somewhat, although maybe not as much as one might think. Printers rated that fast use acceleration and deacceleration to keep from overshooting turns. Can only get the maximum speed on fairly long straight runs of printing. Short runs, turns and tight curves the average print speed slows down. Surprised that you broke parts at 40%. I had looked at the developers notes in his Thingiverse posting and I believe he said that was what he had printed at but that normally printed at much lower fill rates. That's one of the things that makes 3d printing so interesting, or irritating, all the variables that go into it. Out of curiosity, what slicer do you use?