Printing Speeds past 150.
I haven't really been able to print anything faster that 150mm/s . I have tried, Elegoo rapid pla +, Elegoo Rapid PETG, Other PETG, Normal Elegoo PLA. The printer is pretty well tuned and my graphs look pretty good. The issue seems to be balancing Temperature, Fans, Speed, Extrusion Multiplier, and Pressure advanced, Retraction and detraction speed and length. It just seems that going faster makes it very inconsistent in how much plastic it is laying down. My filament is feeding from a drying chamber and all my filament is stored and dried before using.
I am assuming that I am just butting my head up against the issues everyone has to figure out and balance but I want to ask if i am missing something. I like to make stuff from PETG, ASA or PLA. Is there a better manufacturer of those I should be using? is there maybe something wrong with how i have my feeder tightened or how much friction there is in the PTFE tube that feeds the plastic?
14 Replies
what hotend/extruder/nozzle/nozzle diameter are you using?
what flow rates are being listed by mainsail?
using a standard brass .6 nozzle, vc4 500, so orbiter 2 . I ran a temp tower, fan tower, PA advanced block. speed tower. I can now push 200 but 300 just fails before a 5diameter corner and after the corner. first picture is going into the turn and 2nd is coming out. this is not the lift corner.3rd pic is running at 200. adjusting fan doesn’t seem to do it. it’s like it can’t handle decelerating so fast from 300. to 5ish for the corner and accelerating to speed
What is your max flowrate set at and what temp are you using for pla?
i seem to be able to print at around 32 flow rate but past that it messes up corners. especially after a long straight away. this elegoo rapid pla plus is temp rated for 200-230. i am running at 230 according to my temp tower tests and fan test. the fans run with always on and dynamic adjustment. between 40% and 80% any higher and it almost cools too fast. this is at layer height .3. slow down print if less than 3 seconds
fast printers like ratrig don't follow the recommended print temps, to go fast you gotta crank that heat up
i did more troubleshooting than i wanted to today but yes i found cranking to 240 did help a bit . did clear up some things in. the orbiters. but i see a lot of wavy diagonal lines in my infill so i have to figure out what is loose on the printer head.
Might also be you have the tension too high
weird, so wobble can be belts too high? i would have thought the opposite.
what about fans when you crank up the heat. seems like fans over 40% at least on this elegoo rapid pla plus seem to make the issue worse the higher the speed. but also see some saggy
what about fans when you crank up the heat. seems like fans over 40% at least on this elegoo rapid pla plus seem to make the issue worse the higher the speed. but also see some saggy
As you go fast and faster the tuning is less forgiving. The tighter belts can leave artifacts because of the belt ribs going over the smooth bearings
it really seems like you are just printing with a too high of a flow rate and the hotend cant keep up, causing holes and inconsistancies, those speeds listed for your filament are likely based on a 0.4mm nozzle, with a 0.6mm nozzle you can get a bit more flow rate out of your hotend due to reduced backpressue but since you are laying thicker and wider lines you will put out much more material for the same speed. The difference is huge with the thicker/wider lines:
0.2x0.45=0.09mm^2 of surface area for a 0.4mm nozzle.
0.3x0.65=0.195mm^2 of surface area for a 0.6mm nozzle.
That is (0.195/0.09)x100 = +-216.67% material at the same speed while the heating power stays the same
On my big machine I use a 0.6mm high flow CHT volcano for PLA at 220 deg C and PETG at 240/250 deg C and max out at 30-35mm^3 flow rate. The movement speeds at those flow rates are roughly 180-220mm/s because of the thick lines. That is just under the edge that the Rapido can keep up with, the graphs show its between 60-85% heating.
and you dont want to push it just below the max what it can do, as it will already underextrude before the flow completely halts
so lower the max flowrate or bump the temps even higher
the super high 400/500mm/s+ movement speeds only really work at thinner layer heights or with much higher flow rates or better flowing filaments
you could try running https://www.youtube.com/watch?v=lBi0-NotcP0 and see what max flowrate you get at various temps
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It helped to reduce the drag from the spool to the tool. ill have to enclose the filament next. get a little more consistency with it pulling in and out
This was gold on my vc4 500 idex
Thanks!