Made these Robo R2 overhang prints at 0.1mm layer height using Robo PLA and sliced on Simplify3D. The print on the right was just under 10 hours. https://www.thingiverse.com/thing:2374380 https://www.thingiverse.com/thing:699366 The backside of the print on the left is a little scruffy at the 70 & 80 degree points. Of course this torture test was done with no supports. It helps to know what's possible when designing models. Some folks use a rule of thumb of avoiding overhangs greater than 45 degrees. Going 60 degrees is no problem on the R2, and 70 or 80 degrees is fine if you can live with the underside. This model acted as a spring and I could see the top getting pushed down as the nozzle built the 70-80 degree areas. An 80 degree overhang coming off a more ridged base would perform better. Overall I'm very happy with the results.