I printed the 6 cog version with Makergeek Crystal PLA. 3 shells 25% infill. I had some stringing issues early on and turned the heat down after the few layers. Once the print was complete, my first impression is it was hopelessly one solid block. After some fiddling with a screw driver, I managed to get the gears to move. But in the process I seem to have split about 1/4" off one of the gears. I think the model might benefit from greater tolerances between. Scaling it larger may be a quick and dirty way to achieve that.