mrehorst

Thanks for the input. I was using ABS (usually do), not PLA, but I will try reducing the temperature the next time I put the 0.8 mm nozzle on the machine. Right now it's back to 0.4 mm.

Thanks, I'm using a smoothieboard, so the firmware is smoothieware, but it shouldn't matter- the gcode is almost identical to that used by Marlin.

I am used to using volumetric extrusion in Slic3r and now trying in Cura. I slice and save gcode to SD card, and print from the card. In Slic3r when I select volumetric extrusion, it calculates extrusion based on a filament diameter of 1.128379 mm. Before I print the gcode I enter the actual filament diameter into the printer's controller using the LCD panel/rotary encoder. The gcode file can be used with any diameter filament, as long as I enter the diameter at print time. What exactly does Cura do with volumetric extrusion? If I enter a filament diameter in Cura will it be ignored or will the extrusion be calculated for that specific diameter? Thanks!

I've been struggling with print quality using a newly installed volcano with a 0.8 mm nozzle. The extrusion stops a couple mm before the end of a layer and leaves gaps in the prints. It's as if coasting were turned on and set too long. I tried turning on coasting and setting a negative value, but Cura won't slice when I do that. How do I get it to extrude right to the end of the line? There is also a small gap that occurs during printing (marked "?") that I'll tackle after I get the bigger problem solved. I had a similar gap at the start of each layer, after a relatively long travel move. The infill is supposed to start at the perimeter, but there's about a 5 mm long gap between the perimeter and the start of the infill. I solved that by turning on retraction at 0.1 mm, and setting the retraction extra prime amount to 4 mm. I'm wondering if the surface tension of the molten filament is pulling the filament back up into the heater block with this large nozzle. I don't need to use retraction at all, and I have this problem with the plastic not starting exactly when it should, and stopping a little too soon. I did not see this behavior with a standard v6 heater block and a 0.4 mm nozzle. I did see similar behavior with the standard heater block and a 0.6 mm nozzle. I'm printing ABS, extruder temp is 270C, printing at a modest 50mm/sec, 150mm/sec travel. I would appreciate insight from the experts. Thanks!