I just bought a pair of the HF hot ends. I’m really hoping Bambu gives us the full set of calibration tests in the slicer so we can actually tune these hot ends to the filaments.
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I waited all day to order these. Unfortunately, there wasn’t a time specified. When I was in the car, I received an email saying I could order again. Unfortunately, I didn’t get home until 20 minutes later to read the email. And who would have thought? SOLD OUT!
HF nozzle showed up in stock for the US store for me. Just bought them.
How’s printing TPU going for you? I have Siraya Tech 85A that I really enjoy using on my other printers. I have my AMS on top of the printer and don’t really have a way to bypass the bowden tubes to the print head.
I mainly print 95A and 95A HF no problems with those.
I have a roll of eSUN 83A TPE im dying to try, a bit nervous though.
Another member just made this model, should work for 85A he tested it.
I’ve been trying to figure out some ironing settings that would work for the H2D with the high-flow hotends, so far I’ve printed a variety of test prints off makerworld, but none have satisfactory surfaces.
On the X1C, with some Microswiss high-flow nozzles, I could get decent ironing for small areas just by bumping the flow up to 20%, and get extremely good ironing by setting the speed to 150mm/s with a flow of 20%.
On the h2d, with 2 .4mm high-flows, it seems like every ironing setting I try results in choppy, ugly surfaces, regardless of filament type.
What settings are people using for ironing?
Getting good results with petg hf and changing flow to 24
I’ll have to give it a try. I’m printing a 150-200mm/s test print right now, maybe it will have some decent values.
It consistently looks like each surface has some under-extrusion, so I might pump up the flow rate, although even at 50% its bumpy
Sorry I should have made it clear the only setting I change for ironing is the ironing flow to 24. I wouldn’t say it’s perfect but it’s like 98%.
If the calibration print I’m making doesn’t work, I’ll try printing a little rectangle with that. Thanks!
Update: Did a bunch of tests, and by far and above the smoothest were between 130-150mm/s, at 25-40% flow, line spacing at .10-15 (which meshes with what @MotoGP11991 was saying). With PLA, you can get a rather nice smooth finish, within the limits of the material, and with PETG its glassy, almost injection molded quality. Going slower harmed the surface finish, and as flow increased the risk of bubbles seemed to crop up, with more of the 40% prints having issues than the 25% or 30% prints had
I don’t have a Vision encoder yet, but when I do I suspect that will improve the quality further
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I just got one. Sliced a print for my P1P, and then thought, Oh! Let’s try to H2D with the high flow nozzle. Well, the calculation showed 1 hour longer print time. I also picked up a high flow nozzle for my X1C, and it seems that in Bambu Slicer, changing the nozzle type to the high flow is not an option, nor on the user interface of the X1C. I’m not thrilled with either. Seems the software and maybe the firmware isn’t ready for the sales pitch they’re providing. I can’t seem to find any info on the Wiki. I’m bummed, and not stupid… I should be able to figure this out, butt it seem out of line with the company’s core strengths.
Realistically:
HF nozzle = better layer bonding = stronger parts.
That’s all.
The current limits of many models are simply thermal plastic itself. Even if the motion system and the extruders are perfect, there’s no escape from the filaments’ limitations.
If I push more filament out within the same time = I get more warping for that speed. While this might not show issues for simple models, I often find it very much true for more complex models.
You will need to modify the max volumetric flow for each filament on the high flow setting to see any difference in speed. Change PLA from 14 to 30 or 40, up your speeds, then try again. Imo they’re worth it.
You can test for MVF on the H2D with this trick
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I just purchased eight 0.6 mm and 0.8 mm HF nozzles—had no idea they were even available. I stocked up this time, since Bambu Lab hasn’t exactly built a reputation for consistent availability or particularly generous handling of stock issues 
I’m using both standard and HF 0.4 nozzle: if you print in PLA Basic, PETG HF or other high flow materials then the difference is visible, but if you print “slow” materials (for example PA) then nothing changes between normal and HF nozzle, but only between 0.4 and 0.6 standard nozzle.
For those materials I manually bumped the max flow by 20-40% for HF. The proper way to do it is by doing a max flow rate test, but I did it the guesstimate way. So far no problems or defect in print quality.
Anyone else notice they changed the filament compatibility chart? The 0.4mm HF hot end used to have the check mark next to all filaments besides the 85 & 90 tpu. Now there’s a few that say not recommended.
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