Looking at using 0.6 or 0.8 nozzles
wonder what the max volumetric flow the hotend/extruder can do
I see petg limited to 14 mm3. this sems low
The SoftFever fork contains a volumetric flow test. Bambu’s presets for their own PETG are for a CF version, which I think would require a lower max. Run the test yourself.
3 Likes
So far I have done 3 test prints at 13, 17 and 20 mm3 using 0.6 nozzle and carbon Fiber PETG and i havent hit the limit yet. its been very consistent
The softfork test is for tuning small Extrusion Multipler variations to achieve a smoother surface. this is different as im trying to determine max extrusion speed/volume
1 Like
The test you want is this:
If you check the current setting for Max Volumetric Speed in the Filament editor you can use that as a start speed. Like for PC I used 15 to a max of 30 (listed at .16). I found the Bambu setting was ultra conservative.
I printed in SPORT mode at 28 and had zero issues, quite a bit up from the 16 default.
SoftFever hasn’t documented (yet, he’s busy) how to evaluate the print but it’s a test devised by CNC Kitchen with a video on his channel. Printables
That’s the print.
TO check it, find where print quality declines and measure the steps up (it increments in steps of 5mm). Use the value one step down from the bad spot. Watch the video if this makes no sense! LOL 
3 Likes