The point of "high speed" filament is that it retains layer adhesion at higher flow rates. Polymaker defines it as filament that has at least 80% of normal layer adhesion at 24mm³/s extrusion rate. You can print any PLA at high speeds, it will just result in lower strength. Two things to keep in mind: 1) it doesn't matter unless you're actually pushing high flow rates 2) many brands are labeling standard PLA as high speed.
You forgot to include line width into the calculation. When I print with PETG the limiting factor is my volumetric flow of about 15mm³/s or so with the faster PLA I can reach 30mm³/s. It will not double my output or half the print time but it helps a lot. I print infill with 0.6-0.8mm line width with a 0.4mm nozzle so I reach the maximum output regulary. You changed print speed instead of increasing volumetric output.
I was told that the Nozzel is the limiter, the 0.4mm can only go as fast as 20 volumetric flow, which would then by the equation of volumetric flow max the speed out at 200mm/s no matter what filament you use, its finding a filament that you can reach that 20 volumetric flow with, high speed goes up to 18 the closes, and generic pla is like 12, and silk is 7.5
I actually use both their TPU and Highspeed TPU! The high speed stuff definitely makes a difference, as the print speed for normal TPU is quite slow. I’ll think about putting a comparison video out on that.
@@PrintPractical Thank you! I have been using their standard TPU with a 2.4mm3/s volumetric flow rate and 30mm/s on 0.2mm walls. Hoping the high speed stuff can do better without sacrificing quality. What pressure advance k value are you getting? I can't tell the difference between 0-0.1 k value haha. Printing fine with k=0.02 and 1.03 flow ratio. Cheers
It probably is just a flow rate number. If your machine can pull and push 50mm of filament instead of say a prusa mk 3 at 10-12mm and adjusting the heat up does NOT keep up with the flow. At that time you may need a Higher Flow material.
Great analysis of the real factors that limit printing speed. I do wonder if you combine the high-speed filament with high flow ObXidian nozzle what type of performance you can get out of the X1?
Never heard of that nozzle but just looked it up. Definitely would probably help with the keeping up with the flow required for faster printing. I wouldn’t run into issues under extruding at higher speeds like we saw in the video. Though once again, the main limitation of the printer is the max toolhead speed (500mm/s P1S) and max acceleration (20000mm/s^2 P1S). Another thing to note is that at the higher acceleration settings, the amount of vibrations/shaking that occurs during printing is significant. I know the Bambu printers have some compensation algorithms built into the firmware, but who knows what the limits of that is. This could also affect print quality.
I have the ObXidian nozzle and Elegoo Rapid PLA. Its my worst performing volumetric flow PLA in my stock. I used IIID Max for 40 volumetric flow easily at 220-225c. Not only does it underextrude when pushed fast, it's also very stringy. IIID, Bambu and Sunlu don't string and keep up with each other in the 35-40 volumetric bracket without high heat. As for layer adhesion, I have no issues with PLA. PETG is the opposite story with the ObXidian nozzle, which I believe it won't really benefit from the flow or speed because then it just pulls apart.
@@PrintPractical standard speed and acceleration profiles, with volumetric flow controlling each speed when sliced. 350mm/s 0.2 layer and 0.5 line requires a lot of flow.
I've been using 3d printers for a good while. I see my speed top off after the bottom layer is done and it stays that way till the end where at the last 3 to 6 layers it slows. So this doesn't apply to all printers. Most new printers, print like mine with very little down time on speed accept for complicated prints.
It depends on many factors like part geometry and so on. And no your speeds changed all the time your acceleration changes all the time this applies to every machine. You can also tune your volumentric flow output by for example increasing line width for infill and such where you will reach the maximus output where this kind of filament makes a difference.
To me its more about wear and tear on the printer than saving a few minutes. That acceleration and deceleration cant be good for a printer, belts and bearings. I removed a 0 from all standard travel and acceleration settings in hopes of making my printer last longer trouble free.
@@donoteatmikezila Downtime may not be cheap due to loss of revenue or parts not being available to replace a down printer when parts do wear out due to being ran wide open nonstop. Good luck!
This should only be the case if you change your acceleration behavior with the filament as well. Generally speaking your printer will work with the same acceleration regardless thus exerting the same kind of force which the machine it hopefully build for. This kind of filament increases total flow rate from say 15mm³/s to 30mm³/s. Which means you can melt more volume of plastic in the same time or you can pint faster. This helps me for example in infill areas where I ue a 0.6-0.7mm line width with the 0.4mm nozzle to increase print time which is also important for a print farm.
