Flow ratio
Start at 0.98. If plastic builds up on the outside of the nozzle, lower it 0.01–0.03 (for example, to 0.96 or 0.95). Slight over-extrusion has nowhere to go except onto the nozzle. Some printers run fine at 1.0; if first layers don't stick at 0.95, try going back up.
Very high extrusion multipliers (above about 1.05) cause rough, overstuffed parts, especially on 100% solid prints.
Nozzle temperature
- The working range is 250–280°C.
- Use the higher end for faster speeds, thicker layers, or hardened steel nozzles. Higher temperatures also improve layer bonding and gloss.
- Use the lower end for slow, fine-detail prints.
- Too hot (around 280°C) can cook plastic on the nozzle into dark specks. Too cold leaves the plastic draggy and weak.
- Below 250°C, Pro PCTG usually doesn't melt fully at normal speeds.
Max volumetric speed
These figures are for a standard 0.4 mm nozzle. Start around 10 mm³/s and don't go above about 15. CF10 and GF10 need 6–8 mm³/s.
Larger nozzles (0.6 mm and up) can often run higher volumetric speeds, but the maximum depends on your hotend and nozzle. Run a max volumetric speed calibration to find your limit rather than guessing. A 0.2 mm nozzle needs about 1 mm³/s.
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