This past weekend I completed the longest continuous print yet on my Prusa Mendel…just under 9 hours straight. It’s the Basalt Pencil Holder from Thingiverse. It was printed at 100% scale, 0.20mm layer height with 0.10 infill on a J-Head with 0.35mm nozzle in translucent green PLA.
It reached 89.8mm in height (one of the taller things I’ve printed) and turned out amazingly well. It’s solid, dense and nearly a perfect print with minimal stringing.
One trick that Brad (Sublime) discovered when testing the J-Head with Slic3r is to tell Slic3r that the 0.35mm nozzle is actually 0.30 which seems to better compensate for the swell of the nozzle under heat and results in less blobbing. Since I updated my profile with that change, the prints have been much cleaner.