Erik Cederberg

@exlink No need to up the bed temperature, just the hotend temperature to help the plastic to melt faster. If you run a .8mm line width, put your slicer at 4mm / 5 lines thick wall.

@exlink The Creality hotends cannot melt near enough plastic to put a 1.0mm nozzle to good use, it has too short of a melt zone in combination with the PTFE lining that gives it really bad thermal performance for high-flow scenarios. It can only do about 10mm3/sec with a 0.8mm nozzle, and this is pushing it. I would suggest you to go down to a 0.8mm nozzle, raise the temperature for printing pla to about 240C, with 0.8mm line width and a 0.25mm layer height, at 40mm/s and see if that works out for you. It cannot be easily stacked with these settings. Larger nozzles (which makes it print faster) also makes single extrusion stacking harder.

@exlink: 20 minutes is not really reasonable on a Ender 3 Pro. The hotend and feeder is not up to that kind of flow rate, i believe the fastest we were able to make our Ender-3's do reliably at Stockholm Makerspace were about 35 minutes each with 0.8mm nozzle, PLA and a higher temperature than usual. Our Ultimakers with 0.8mm nozzles were pushing them out in sub 20 minutes each all day. But to get closer to these numbers, you first need to change your nozzle to a .8mm. A larger nozzle is the single largest print time reducing measure you can do. A larger nozzle will make printing stacks harder though, and my recommendation is that you to print two at a time instead of stacking, it will give you better surface quality and a lower failure rate.