High Flow Nozzle - Use Guide

Bambu Lab H2D
1

Hi all,

My high flow .4 nozzles continue to sit in their box due to my anxiety of new things :slight_smile: Does anyone know of a good guide for setting up the high flow nozzles, calibrating, and expected outcomes? I’ve been reading through various threads but not sure if there is a good “one stop shop”.

Many thanks!
Rob

2

If you want to achieve higher speeds with the HF nozzle, you obviously need to adjust the print speed accordingly. Simply installing the HF nozzle without changing the speed settings won’t result in any noticeable speed improvement with the current defaults.

I’ve tested 50 mm³/s for ASA with excellent results at various speeds, and I believe I’m using around 40 mm³/s for PLA Basic.

The expected outcome depends on the filament type, the volumetric speed (MVS), and the print speed. Not all filaments work well with HF nozzles — softer materials like TPU can even cause severe clogging issues if pushed too hard.

1 Like
3

Thank you for the response!

Understood on the above - was hoping there was a great guide to take this from general high level to a step by step including testing for speed etc.

Guess there is an opportunity for me to make it :slight_smile:

1 Like
4

I mean, it’s literally no different than any other nozzle or hotend upgrade. You can follow any suggestions from any printer…

There isn’t anything special about it, just allows more flow.

5

Thank you for the response.

My understanding is that there aren’t supported profiles yet for this nozzle and that some config needs changed. (Change to high flow direct drive, and I think something else). I also see folks posting about printing at various high flow speeds after testing for an ideal.

Some questions:

  • where all do you need to update config to use the high flow?
  • How do I determine the right print speed for flow and movement? Is there a stock setting or does it need configured / tuned in?
  • Should I see any difference in the expected print time when slicing (high flow vs not).
  • I understand that the H2D only supports identical nozzles currently for dual head. Can I just change out one if the print is only one filament (IE just black on the one side). If so, is there an ideal side to change out?

I appreciate the time it takes to respond (especially if there are helpful details).

Cheers!

1 Like
6

if you want to print faster, the best way is to enable sports mode. The motion system isn’t really the challenge here. You might face other issues though (cooling/warping)

7

Hi.

there are some profile on this page (see below) if you scroll down. Then in Bambu studio you will see you are able to select the HF nozzle. Then I believe you alter the filament flow rate as others have suggested on here.

I think that is all you need to do.

Josh

1 Like
8

I am new to 3d printing as well and have been reading about the HF nozzles, but so far, the more I read, the more questions I have. It seems they are better, but I keep thinking there must be some downside to them. I don’t want to compromise quality or strength for speed, so I haven’t changed to them yet. I have only run ABS up to this point, and it has been running perfectly, so I am scared to change anything. lol

1 Like
9

Hey Keith2,

Thank you for this response and resonating my first post :slight_smile: It’s a confusing issue for me too. I’m similar - my PLA is dialed in and amazing, so I haven’t tried to mess with it. Eventually I should!

I’ll post back assuming I find anything definitive and new-to-high-flow friendly.

Appreciate it again! Happy fourth.

10

i got my cheap high flow nozzles from aliexpress today…

i havent used them yet but i played around in the slicer and set pla basic to high flow - from 25 to 35 - i even went up 5 more to 40mm/s

i then sliced the file and the print took longer than with normal settings…

whats going on here?
:smiley:

11

If you simply install your 0.4 HF nozzle without changing any other settings, you’ll get the same print quality as with a non-HF nozzle—at least in my experience. Switching to HF doesn’t make the print weaker either. With the H2D, nozzle changes are quick and easy, so running a test won’t hurt.

12

i know thats why i said i changed the filament to highflow inside the filament settings… sure i select highflow nozzle… but just selecting them isnt enough… because nothing is chaning when i slice…

nobody said the prints are getting weaker …

13

No, you didn’t — just wanted to point that out for reference.

To actually increase print speed, you also need to adjust the speed settings under your layer configuration. MVS alone doesn’t do much; it simply tells the slicer the maximum flow rate the hotend can handle. You’re likely already close to that limit.

Just to clarify, the correct formula is:

MVS = line width * layer height * speed

So to calculate speed:

speed = MVS / (line width * layer height)

Of course, that’s a theoretical value — in reality, factors like vibrations, cooling, and geometry will usually limit your speed well before you reach that number.

14

Thanks, I think this is what I was looking for. There’s great documentation about installing the nozzle but not how to set it up in the software. Thanks again for the link.

15

Not sure how this is going. Since I have loaded the new profile into Bambu Studio my filament list has defaulted to ABS for some reason. So I am getting errors saying that it is incompatible with the cold plate I have installed though I am not using ABS.

Project filaments were being read upon device sync but I cannot seem to select the eSun PLA+ I am using. For now I have selected PLA Basic.

See how it goes I guess.

16

There is now an “official” HF Preset from Bambu Lab.
Scroll down until you find “Official-Tuned Printer Presets” towards the bottom of the page. There you will find the presets for all of the Bambu Lab printers! :smiley:

Sorry for the mangled link, it won’t post any other way. Just take the spaces out.

us.store. bambulab. com/products/obxidian-high-flow-hotend