Snapmaker U1 High Flow Hotend Beta Testers Calls

News and Announcements
1

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Hi Everyone,

We’re developing a high flow hotend for the Snapmaker U1 to unlock its high-speed printing potential. Whether you’re doing batch production or rapid prototyping, this hotend helps reduce print times. Before the official release, we’re looking for a small group of U1 owners to test them through real-world use. Selected testers will receive four 0.4mm high flow hotends and are expected to share their experience and submit a feedback report after the testing period.

:date: Key Dates

• Application Period: 7.27 – 8.3

• Estimated Testing Cycle: 8.17 –9.20

:memo: How to join

If you’re interested, please answer the following 3 questions in the comments:

  1. What filaments do you use, and what is your usual volumetric flow rate (mm³/s)?
  2. Have you ever disassembled, installed, or tuned the hotend assembly on your printer?
  3. Have you used other high flow hotends? (e.g., CHT 0.6mm brass)

:warning: Please note that the High Flow Hotend accessory test requires the V1.6.0 beta firmware and Snapmaker Orca software. For users currently running the paxx extended firmware, please confirm your willingness to install the official 1.6.0 beta firmware when available.

:wrapped_gift: What you get as a beta tester

  • Four 0.4mm high flow hotends (Free, no need to return)
  • Collaborate with the engineering team to improve the overall experience of this new accessory during the test.
  • Early access to help shape the final product

We’d love to hear from you. If you know other U1 users who might be a good fit, tag them below!

See you in the comments.

20 Likes
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If you’ve already commented in the private Beta Testing Category, no need to repost it here. We’ll make sure your feedback is included.:grinning_face:

1 Like
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  1. PETGCF, PETGGF, TPU, ABS, PLA,Rapid PLA. Flow rates varied from 15mm to 22mm for PLA and 38mm for PETG.
  2. Yes, have removed all four print heads, replaced hot ends, taken print head apart to remove clogged filament.
  3. Have used .8 hot ends on A350, .6 on U1.
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4

I’m interested in testing the new nozzles.

  1. I use A LOT of PETG-HF and TPU due to printing wheelchairs for toddlers and infants, usually use 18-22 mm/s

  2. I have changed my hotends out and changed them to hardened steel ends was a fairly easy project.

  3. I have used a high flow hot end on my Bambu at one pot currently don’t have any

1 Like
5

Hello,

I would like to participate in the test.

  1. Which filaments do you use and what is your typical volumetric flow rate (mm³/s)?

I most often use PLA and PETG. I print PLA on the U1 at 20 mm³/s and PETG at 16 mm³/s.

  1. Have you ever disassembled, installed, or adjusted the hotend module on your printer?

Yes, several times. I also frequently switch between 0.4 mm and 0.6 mm nozzles.

  1. Have you used other high-flow hotends? (e.g., CHT 0.6 mm brass)

I have used high-flow hotends on other printers.

Best regards,

Manuel

1 Like
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  1. I mainly use PLA and PETG, sometimes ASA
  • PLA is mainly Snapmaker SnapSpeed - here I set the maximum flow to 22 - 23 mm3/s.
  • Sunlu PLA HS - here I print at 20 mm3/s.
  • When printing with ASA (CC3D, Anycubic, Sunlu) - 15mm3/s.
  • PETG mainly Sunlu - maximum flow 14-16 mm3/s

  1. Yes, I disassembled and replaced (complete heads no. 2 and 3) I replaced all Hotends with unbranded 0.4 ones from Aliexpress. With 0.4 hardened ones from Juupine, I had to reduce the flow by about 15%

  2. No, I didn’t use 0.6, quite the opposite, I tested prints at 0.2 /

1 Like
7

I would really like to participate in the beta test. I sometimes print with a volumetric flow rate of 20 to 27 mm³/s and have already replaced the nozzles multiple times, as I also print with PETG CF.

Here are the answers to your questions:

  1. Filaments I use and my typical volumetric flow rate:

    I primarily print PETG CF and HF PETG. The typical volumetric flow rate is between 20 and 27 mm³/s.

  2. Experience with hotend assembly:

    Yes, I have disassembled, reinstalled, and tuned the hotend multiple times.

  3. I have several printers, including another Snapmaker, and I have been building my own printers for ten years. I also have a Prusa XL 5. There, I had to replace the nozzles several times because they simply wore out.

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  1. I mainly use PLA(+,Meta,CF,LW), PETG(GF), ASA and TPU
  2. Yes I have, and also on my 5 other Printers (Flashforge 5M pro, Bambulab P1S, Voron 0.1, etc)
  3. Yes, I used a knock off clone hotend for Bambulab P1S with a CHT nozzle
1 Like
9

Hi team,

Hope all is well.

I would be very interested in testing out the high flow hotends.

  1. I use a wide variety of materials including:

PLA basic, pla+, High Speed pla, pla LW, pla matte, pla matte HS and more
Petg standard and petg high speed
TPU
Abs/asa
Pbt pro GF

And many others.

I always calibrate my filaments for their volumetric flow and am sadly limited by the stock hotend in many cases.

The volumetric flow of different filaments I use ranges from 12 to 20 and then I start to notice the limitations of the stock hotend.

  1. I am very comfortable with hotend disassembling the assembly and tuning it, I have done it countless times. I have changed nozzles, cleaned hotends, removed blobs and more very often on u1 and other printers.
  2. As far as experience is concerned, I have ample experience with using high flow hotends across many printers. I have also used the likes of microswiss flow tech which has CHT nozzles. And have used phateus, creality spider ceramic and k1 max. Volcano m6 nozzles, mk8, mk6 etc. In summary, I have a lot of experince with high flow hotends.

I can provide detailed feedback and test the hotends thoroughly based on my experience.

Thank you for the opportunity

1 Like
10

Hi Zoe,

I’d be interested. Answers below.

1) PLA, PETG, ABS, ASA and PCTG, all of them regularly. I calibrate flow myself in Orca instead of going with the profile defaults, which puts me around 20 mm³/s on PLA, 17 on ABS, 16 on ASA, 15 on PETG and 13 on PCTG with the stock 0.4 hotends. PLA is fine. It’s the engineering materials where it gets tight, and that’s where a high flow hotend would actually change something for me.

2) Yes. I’ve had the assembly apart and back together, and I tune pressure advance, flow ratio and the per-toolhead fan behaviour as a matter of course. I’ve also fitted Noctua cooling to the TMC drivers, and at the moment I’m working on an upgrade to 0.9° motors with 1.5GT belts and pulleys.

3) Yes, Bambu Lab and Vortex. So I have a reference for how these behave under sustained flow and where they stop keeping up with their rated numbers.

I use all four toolheads regularly. Report at the end is fine, and I’m free for the 8.17–9.20 window. Based in Germany.

1 Like
11

I’m interested in testing the new nozzles.

  1. I use mainly PLA and PETG usually use 18-22 mm/s

  2. I have changed my hotends out and changed them to hardened steel ends was a fairly easy project.

  3. I have not used any high flow hotends

1 Like
12

I’m also interested in testing the new high flow nozzles.

  1. I use mainly High Speed PLA with volumetric speed 32 mm³/s

  2. I have disassembled the head many times and replaced the hotends with hardened ones, with different diameters and when the material jammed

  3. Yes, I have Phaetus Dragon Hotend HiFlow

Thank you

1 Like
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  1. What filaments do you use, and what is your usual volumetric flow rate (mm³/s)?

PLA PETG and it’s carbon and glass version. Brands ive used most are elegoo, jayo, esun and sunlu. I’ve tuned a few of them to 28mm3/s. Jayo being the fastest flow without issues so far

  1. Have you ever disassembled, installed, or tuned the hotend assembly on your printer?

Yes, multiple times, running 0.6mm nozzle now

  1. Have you used other high flow hotends? (e.g., CHT 0.6mm brass)

Yes, been printing since the ender 3 days and have gone through a variety of printers and hotends

1 Like
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I usually use PETG, PLA-CF ,ABS, as well as PC which snapmaker U1 handles fine, I usually print around 12 with max 20 for best quality. Sometimes for speed testing I have pushed up to 40 with decent results, I use It for fast prints.

I have alot of experience in doing repairs for my other printers as well as mods for U1, I’m very confident I can replace the hotend with the upgraded one without damage as Ive done it before.

Yep I use CHT nozzles for all my printers and my Voron 2.4 uses Dragon UHF hotend so I have alot of experience with high flow hotends and can give appropriate feedback.

1 Like
15

Thank you all for your interest in the High Flow Hotend accessory test.:+1:

Please note that the High Flow Hotend accessory test requires the V1.6.0 beta firmware and Snapmaker Orca software. For users currently running the paxx extended firmware, please confirm your willingness to install the official 1.6.0 beta firmware when available.

3 Likes
16

Hi Zoe,

Thank you for the opportunity to participate in the Snapmaker U1 high-flow hotend beta test. I’m very interested in supporting the evaluation and providing structured, practical feedback based on real-world printing and calibration.

Please find my answers below:

  1. What filaments do you use, and what is your usual volumetric flow rate?

I regularly print with Snapmaker SnapSpeed PLA, standard and matte PLA, PETG, and TPU 95A. I also plan to use ASA and nylon-based engineering materials for functional parts, when the hotend and nozzle are confirmed as compatible.

Depending on the material, my current working volumetric flow rates are generally around:

  • PLA/SnapSpeed PLA: approximately 20–25 mm³/s
  • PETG: approximately 12–18 mm³/s
  • ASA: approximately 10–16 mm³/s
  • TPU 95A: approximately 5–8 mm³/s

For this beta test, I would be particularly interested in testing:

  • SnapSpeed PLA for maximum stable flow and print-time reduction
  • PETG to evaluate sustained high-flow performance, stringing, and surface quality
  • Matte PLA to determine whether the hotend maintains consistent extrusion with filled or more flow-sensitive materials
  • ASA for functional rapid-prototyping applications and longer prints inside the U1 enclosure
  • TPU 95A as an edge-case test to understand how the high-flow design performs with flexible filament
  • Abrasive or carbon-fiber materials only if Snapmaker confirms that the beta hotend and nozzle are designed for them

I would test both rapid prototypes and repeated-part batches so the hotends are evaluated during short prints, long continuous prints, and frequent tool changes.

  1. Have you ever disassembled, installed, or tuned the hotend assembly on your printer?

Yes. I am comfortable removing, installing, inspecting, and tuning hotends and nozzles on my U1. I use Orca Slicer and perform material-specific calibration rather than relying only on default profiles, including temperature, flow ratio, pressure advance, retraction, bed leveling, and maximum volumetric speed calibration.

I am also comfortable following engineering instructions, documenting the installation process, identifying usability issues, and recording any differences among the four toolheads. One area I would specifically evaluate is whether all four beta hotends provide consistent flow, temperature behavior, dimensional accuracy, and surface quality under the same settings.

  1. Have you used other high-flow hotends, such as a CHT 0.6 mm brass hotend?

I have experience using different nozzle sizes and tuning profiles for higher-speed printing, but I have not yet used a dedicated CHT-style high-flow hotend. I believe this would provide Snapmaker with a useful perspective: I can compare the beta hotend directly against the standard U1 configuration without expectations being influenced by another manufacturer’s high-flow system, while still applying a structured calibration and evaluation process.

My proposed testing would include controlled A/B comparisons using the same models, filament, temperatures, and slicer settings. I would document maximum stable volumetric flow, total print time, surface quality, dimensional accuracy, layer adhesion, overhangs, bridging, stringing, extrusion consistency, clogging or heat-creep behavior, and consistency across all four toolheads.

I can provide the engineering team with photos, calibration results, Orca profiles, print logs, failure observations, and clear recommendations before the end of the testing period. I would be very interested in helping Snapmaker determine not only how fast the new hotend can print, but also where its reliable operating limits are for different real-world materials.

Regards

Adrian Zaragoza

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Hi,

I would love to test the new High Flow Hotend.

I currently use Snapmaker SnapSpeed PLA filament with the standard printing settings. My printer is equipped with the original hardened steel hotend, which I installed and calibrated myself. I have already gained experience with High Flow hotends on other 3D printers, but not on the Snapmaker U1.

I would be happy to compare the new High Flow Hotend directly with the original hardened steel hotend and provide detailed feedback on print quality, flow performance, and reliability.

Thank you for considering my application!

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  1. PLA: Default SnapMaker flow rate 20 mm³/s, I use it for all brands.
    PETG: I use the Snorca “Generic PETG” profile, 12 mm³/s.
    TPU: I use the Snorca “Snapmaker TPU 90A” profile, 3.2 mm³/s.
  2. I have disassembled, replaced and installed the hotends on all my printers. Including the U1. It had an issue where it could not load filament and I fixed it with the “Snapmaker U1 - Revised Filament Path Extruder Cover” model from printables.
  3. I have never used other high flow hotends.
19

Hi Zoe,

Will live to participate:

  1. What filaments do you use, and what is your usual volumetric flow rate (mm³/s)?
    - other than snapspeed PLA, I have Jayo PLA+, Jayo PETG, Budget PLA silk, Budget PLA, Budget PLA+ etc
    - max volumetric flow rate has been adjusted to 15-20 mm3/s. Thought have tested to max using SnOrca’s Maximum Volumetric Flow calibration.
  2. Have you ever disassembled, installed, or tuned the hotend assembly on your printer?
    - yes
  3. Have you used other high flow hotends? (e.g., CHT 0.6mm brass)
  • No

Regards,

Chin Loon

| Zoe_M
July 29 |

  • | - |

Hi Everyone,

We’re developing a high flow hotend for the Snapmaker U1 to unlock its high-speed printing potential. Whether you’re doing batch production or rapid prototyping, this hotend helps reduce print times. Before the official release, we’re looking for a small group of U1 owners to test them through real-world use. Selected testers will receive four 0.4mm high flow hotends and are expected to share their experience and submit a feedback report after the testing period.

:date:Key Dates

• Application Period: 7.27 – 8.3

• Estimated Testing Cycle: 8.17 –9.20

:memo:How to join

If you’re interested, please answer the following 3 questions in the comments:

  1. What filaments do you use, and what is your usual volumetric flow rate (mm³/s)?
  2. Have you ever disassembled, installed, or tuned the hotend assembly on your printer?
  3. Have you used other high flow hotends? (e.g., CHT 0.6mm brass)

:wrapped_gift:What you get as a beta tester

  • Four 0.4mm high flow hotends (Free, no need to return)
  • Collaborate with the engineering team to improve the overall experience of this new accessory during the test.
  • Early access to help shape the final product

We’d love to hear from you. If you know other U1 users who might be a good fit, tag them below!

See you in the comments.

20
  1. What filaments do you use, and what is your usual volumetric flow rate (mm³/s)?
  • TPU - 4mm/s
  • ABS - 26mm/s
  • ASA - 20mm/s
  • TPE - 4mm/s
  • PETG - 15mm/s
  • PLA - 20mm/s
  1. Have you ever disassembled, installed, or tuned the hotend assembly on your printer?
  • Yes , on the U1 have replaced nozzles , on other printers have upgraded hotends and nozzles
  1. Have you used other high flow hotends? (e.g., CHT 0.6mm brass)
  • Yes I use Triangle Labs CHCB-OTC with Hardened nozzles of all sizes and Microswiss Flowtech with CHT-CM2 Hardened 0.4 and 0.6