Snapmaker U1 High Flow Hotend Beta Testers Calls

News and Announcements
81

I would be happy to test the new high flow hotend for the U1.

  1. What filaments do you use, and what is your usual volumetric flow rate (mm³/s)?
    I typically print in Sunlu PETG, but have historically printed with PLA (basic, matte, metallic, plus/2.0, HF), PETG, ASA, and ABS.

  2. Have you ever disassembled, installed, or tuned the hotend assembly on your printer?
    I have disassembled, cleaned, repaired, and reinstalled hotends for the SM 1, A350, and the U1.

  3. Have you used other high flow hotends? (e.g., CHT 0.6mm brass)
    I have only used conventional/stock hotends on my printers.

    I have no problem installing test-specifc firmware.

82

Hi Zoe,

I am interested in joining the beta testing program for the Snapmaker U1 High Flow Hotend. Please find my responses to the application questions below:

  1. What filaments do you use, and what is your usual volumetric flow rate (mm³/s)?
    PLA → 15 mm³/s PETG → 12 mm³/s

  2. Have you ever disassembled, installed, or tuned the hotend assembly on your printer?
    Yes many times

  3. Have you used other high flow hotends? (e.g., CHT 0.6mm brass)
    No → I would love to test

Thank you for the opportunity to participate.

Best regards,
avichai rebibo

83

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

    PLA - 12 mm³/s
    PETG - 12 mm³/s
    TPU - 2.5 mm³/s

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

Yes, many times. Pretty much inevitable that it happens from time to time with TPU, and especially when tuning.

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

None.

84

Hello,

I’d like to participate in the beta test. I run a Snapmaker U1 alongside a Bambu H2S, H2C, AND X2D’S, so I can benchmark the HF nozzles against comparable hardware and report differences with real side-by-side data.

1. Which filaments do you use, and what is your typical volumetric flow rate?

I print across a wide range: PLA, PETG, ASA, ABS, TPU, and the CF-filled variants of PLA and PETG. Every spool gets calibrated before production use — flow ratio, pressure advance, and a max-flow test to find the actual ceiling rather than trusting the spool label.

Typical numbers on a 0.4 mm at 0.2 mm layer height:

  • PLA: ~20-24 mm³/s on a good hotend
  • PETG: ~ 15 mm³/s definetly quality limted before thermally limited
  • PLA-CF / PETG-CF: ~15mm³/s (abrasive wear is a real interest of mine here)
  • ASA/ABS: ~15 mm³/s
  • TPU: ~ 5 mm³/s

Most of my larger functional parts are currently flow limited, not motion limited, which is exactly why high flow interests me.

2. Have you ever disassembled, installed, or adjusted the hotend module?

Yes, routinely. I swap between 0.4 mm and 0.6 mm nozzles regularly, and I’m comfortable with full hotend teardowns, heat break and thermistor handling, PID tuning after a swap, and Z-offset/first-layer recalibration. I’m not going to need hand holding on installation, and I’ll document anything unclear in the process.

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

Yes, I’ve run high-flow/CHT-style nozzles on other machines and have a good feel for where they help (large-format functional parts, thick walls, coarse layers) and where they don’t (fine detail, stringing behavior on PETG, retraction tuning). That gives me a baseline to compare the Snapmaker HF nozzles against rather than judging them in isolation.

What I can contribute

I use my printers for real work, not just test prints, engraved industrial identification tags, functional fixtures, and enclosure parts, often in CF filled and high-temp materials. That means sustained print hours and abrasive wear data, not one weekend of benchmarks.

I’m happy to provide:

  • Max flow test results per material, before and after the swap
  • Print time and surface quality comparisons at matched settings
  • Long term wear observations with CF filaments
  • Photos and profile configs with any feedback I submit

Thanks for considering me

85

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

  • PETG, PETG HF/HS, PLA, PLA HF/HS, and TPA 95A; brands range from Snapmaker, JAYO, SUNLU, and several lesser known brands.

  • Tricky question as every filament is manually calibrated for each nozzle size and max speed (mm/s) to use adaptive p-adv. Yet for a 0.4 mm nozzle:

    • Max values: 9, 9.8, 10, 10.3, 14.5, 15.5, 21, and 22 mm³/s
    • Mid values: 6.26, 6.81, 7.35, 7.73, 9.28, and 14.3 mm³/s
    • Minimum is typically 3.87 mm³/s

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

  • Yes, many times on the U1. Happy to also share pictures (w/ scale reference) and videos if needed for this beta test.

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

  • Yes, for the U1 I own several sets of hardened steel nozzles from 0.2 mm to 0.8 mm. And for the H2D I’ve used HF 0.4 nozzles.
86

I would love to be a tester for these high flow nozzles.

1. Filaments & Flow Rates

​PLA / High-Speed PLA: Standard 22 mm³/s

​PETG: Standard 16 mm³/s

​Experienced with testing various filament brands and types.

​2. Hotend Maintenance & Toolhead Experience

​U1 Teardown: Fully disassembled a U1 toolhead assembly, replaced components, and cleared a severe filament blob.

​Troubleshooting: Reconfigured system to bypass the damaged hotend and kept production running on the remaining 3 toolheads. Very comfortable with hardware maintenance and tuning.

​3. High-Flow Experience

​Currently run a 0.6mm BIQU CHT-style High Flow hotend on a Bambu A1, pushing 25–32 mm³/s depending on material.

​Testing Plan Outline

​Volumetric Flow Limits: Run step-ladder flow tests to chart exact mm^3/s ceilings on PLA and PETG.

​Multi-Head Parity: Install all 4 hotends to test flow consistency and temp stability across toolheads.

​Speed & Quality Scaling: Benchmark surface quality, layer adhesion, and accuracy at 150–500 mm/s.

​Endurance & Reports: Run 12+ hour batch prints to monitor heat creep, nozzle ooze on parked heads, and deliver clear, actionable data.

Compare print time savings with regular vs high flow nozzles on the same models.

I hope to be chosen for this cool opportunity to make a difference in the expansion of the product line!

87

Hi Zoe, hi everyone,

here are my answers to the three questions:

1. Which filaments do you use, and what volumetric flow rates do you typically run?

I print a lot of engineering-grade material, not just PLA. Currently in rotation: PLA and PETG for everyday work, ABS (including nobufil ABSx, which I calibrated a full profile for), PC, and carbon-fibre filled materials - PETG-CF and a glass-fibre reinforced PP I’m currently testing for a filament manufacturer.

My volumetric flow rates typically sit between 15 and 25 mm3/s depending on material and part. I calibrate max volumetric flow per filament before anything else, so those are measured numbers rather than guesses - and that’s exactly why a high flow hotend is interesting to me.

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

Yes. I swap nozzles regularly - I’ve done a whole video on printing with the 0.2 mm nozzle on the U1 - and I’m comfortable taking the machine apart. I run two U1s, both on paxx12 extended firmware, one with the multiACE switch mod installed. Mainboard and stepper driver cooling is my next build. I document everything I do, including the parts that go wrong.

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

Yes, but not on the U1 - only on other machines in my workshop. So I know what high flow feels like and what to look for, but I have no preconceptions about how it behaves on this printer. That combination might be useful for you: I can compare against other platforms without assuming the U1 will behave the same way.

On the firmware note: I saw the request for paxx users to confirm. Since I have two U1s, I can dedicate one machine entirely to the official V1.6.0 beta firmware for the test window and keep the other on my usual setup. So no conflict there.

One more thing that might be relevant: I run “Der Druckt Schon Wieder”, a German-language 3D printing channel with a weekly news show. I test systematically and I’m not shy about reporting what doesn’t work - which is what makes feedback worth anything. My audience is the German-speaking U1 community, so the findings wouldn’t disappear into a private report.

Best regards,

Jens

1 Like
88

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

Currently doing a Multibin wall in PETG from SUNLU and OVERTURE. Tested up to 26mm3/s without any issues, but sticking to 18mm3/s for now for dimensional accuracy

The bins are being printed in PLA/PLA HT/PLA Matte at 16 to 20mm3/s depending on the filament type and brand.

Also print in ASA at 12mm3/s, more because I don’t have an active heater and couldn’t tune in the filament yet.

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

Yes. Disassembled fully to fix an issue following Snapmaker support team and also replaced nozzles with hardened steel nozzle. I also have a Voron 2.4 printer, so I’m very used to disassembling, building and tuning printers.

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

I used CHT clone 0.4mm on my Voron to print ASA. On my U1 only used regular and hardened steel nozzles.

1 Like
89

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

I use a wide variety of filaments, including PLA, PETG, PETG-CF, ABS, ABS-GF, ASA-GF, ABS/ASA-CF, PET-CF, TPU, PEBA, foaming TPU, PA6, PA612, and others. I enjoy learning about and testing new materials and products.

My typical volumetric flow rates are:

  • TPU: 3–6 mm³/s
  • PETG: 15–20 mm³/s
  • PLA: 15–28 mm³/s
  • ABS/ASA: 15–18 mm³/s

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

Yes. On the Snapmaker U1, I have disassembled the hotend assembly, swapped standard hotends for hardened hotends, and repaired several clogged hotends for others.

I have experience using nozzle sizes from 0.2 mm to 0.8 mm and regularly perform max-flow testing, flow-rate calibration, retraction tuning, temperature towers, and pressure advance calibration.

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

Yes. I have used and tested several hotend and nozzle systems, including Mellow3D, CHC V6, Volcano, CHC standard V6, E3D ObXidian, DiamondBack, and the Phaetus Conch in sizes ranging from 0.2 mm to 0.8 mm.

I am looking forward to trying the upcoming HF hotends. Will they combine high-flow performance with a hardened, abrasion-resistant construction?

1 Like
90

Hi Zoe,

I am applying to participate in the test.

  1. What type of filament do you use, and what is the typical volumetric flow rate (mm³/s)?

I mainly use PETG. On the U1, the volumetric flow rate for PETG is 16 mm³/s.

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

Yes, multiple times. I also frequently swap out 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.

Thank you. Best regards.

91
  1. What filaments do you use, and what is your usual volumetric flow rate (mm³/s)?
    1. I mosty use IIID Max For basic colors, and them SunLu and AMolen for Silks and special colors. I print PLA+ mostly. I do print some PETG in black ans whites. I print most PLA at 24.75 and High Speed PLA’s at 55
  2. Have you ever disassembled, installed, or tuned the hotend assembly on your printer?
    1. Yes, a couple times on my U1, multiple times on my older Ender 3 Pro, and a few times on my Bambu A1
  3. Have you used other high flow hotends? (e.g., CHT 0.6mm brass)
    1. No.
92

I would like to participate in the test.

  1. I most often use PLA, I print PLA on the U1 at 22 mm³/s
  2. Yes, several times (have 25 Printers, at least twice a week 8-))
  3. Not in SnapMaker (for FlashForge, Conch from phaetus printing in 35 mm³/s)
1 Like
93

I primarily use PLA

Yes

No I have only used regular hot ends

94

Does this thread not close automatically @Zoe_M now the time is up?

95

First post says applications close tomorrow.

1 Like
96

that will be why then :rofl:

1 Like
97

I’d be interested in testing the U1 High Flow Hotends.

I primarily print PLA and PETG. My usual volumetric flow is approximately 20–25 mm³/s for PLA and 15–20 mm³/s for PETG, depending on the filament brand, temperature, and model. I am comfortable running flow-rate tests and tuning the profiles to determine the hotend’s actual limits.

Yes. I have disassembled, installed, replaced, and tuned complete hotend assemblies on several printers, including my Snapmaker U1 and Bambu printers. I am comfortable working with nozzles, heaters, thermistors, thermal grease, mounting hardware, temperature settings, retraction, and flow calibration.

Yes. I have experience with high-flow hotends, including an E3D ObXidian 500 high-flow hotend, as well as different nozzle sizes and materials.

I regularly print functional parts and would be able to test the four hotends with both PLA and PETG under real-world conditions, compare print quality and flow limits, and provide detailed feedback. I am also willing to install the official V1.6.0 beta firmware and use Snapmaker Orca for the testing period.

98

Hi All, Thank you all for your interest in the High Flow beta test.

The recruitment window is now officially closed. We are currently in the process of reviewing all applications. The final selection list and corresponding logistics arrangements for device delivery will be announced as soon as possible.

7 Likes
100

Hi everyone,
Thank you all for your great interest and active applications for the Snapmaker U1 High Flow Hotend beta test.
We received a total of 94 submissions. After comprehensive review, 30 beta testers have been selected.
Our selection criteria:

  • Geographic diversity to gather feedback from varied operating environments
  • Mix of experienced high‑flow hotend users and first‑time users
  • Willingness to actively participate and provide detailed feedback
  • Background in batch printing or rapid prototype iteration

With limited spots available, the final selection involved some tough choices. We sincerely apologize to those who were not selected this time. Please stay tuned, as we plan to open more beta testing opportunities in the near future!

Thank you again for your continued support.
Selected Beta Testers (In no particular order)

@CrazyIvan @RepairAndTinker @jiyang1018 @unlucio @ezeitoun @Cheeky_b52 @fatboy1271 @Boz91 @mauker @WildTang3nt @LixNix @DerDrucktSchonWieder @xmg67

@drstraleman @gh0st31337 @holmes21 @NozzleClog3D @rfnovo @SNAPMAKERGOAT @zimz @AdrianZE @Brian_Miller @cgabri @V1nce_78 @donhaze @Uniqueacid @ITZ_DEEJAY @Johnny_Bit @nikolarun @ni42

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