Creality Hi Known Issues & Fixes

The Creality Hi is a bedslinger with CFS released in late 2024, aimed squarely at the Bambu Lab A1. It has plenty going for it: step-servo X/Y motors with positional feedback, an auto-leveling strain gauge in the toolhead, and the same high-flow Unicorn nozzle as the K2 Plus. But it also has a unique set of pitfalls the marketing won't tell you about — we've covered 18 of them, from factory QC misses and the 1.1.0.56 firmware that kills the part fan, to fundamental incompatibility with soft TPU. Generic FDM problems (stringing, warping, ringing) are covered in our cross-printer guides — links at the bottom.

1. TPU just won't print — instant extruder jam

Hi's spec sheet lists TPU as supported. In practice, soft TPU at 90A — let alone 80A/75A/70A — won't print on this machine. The high-flow extruder gears flatten soft filament in seconds and feed stops. Tom's Hardware confirmed the same thing in their review: even bypassing the CFS and feeding directly, TPU jams the extruder almost immediately. There isn't even a TPU profile in Creality Print — Creality's own engineers couldn't get it working.

1. Stick to TPU 95A or harder — CR-TPU, HP-TPU, Generic TPU. 90A and softer don't work on the Hi at all, no setup will save you.
2. Purge the nozzle before loading TPU: heat to 240°C and push 50–80 mm of PLA or filament cleaner through to clear high-temp residue.
3. Park the dry box on the left of the printer, at the same height as the extruder. No PTFE tube — soft filament catches and bends inside one.
4. In Creality Print: nozzle 220°C, smooth PEI bed ≥40°C, max volumetric speed 2 mm³/s for CR-TPU/Generic, 3 mm³/s for HP-TPU.
5. On the printer screen, pick the right TPU type before loading (Settings → Filament). If PLA is selected, the retract logic will be wrong.
6. At the first sign of grinding: Prepare → Filament → Retract, then disassemble the extruder via the «clogged extruder» procedure and pull the stub.

2. Recurring extruder jams every 2-3 weeks — by cutter design

On the Creality forum, an Hi owner writes that the first three weeks were trouble-free, then jams started showing up every 2-3 weeks. Replacing the extruder, PTFE tube, nozzle, and even the PCBA G adapter board didn't help. The root cause: the cutter slices the filament before retract, leaving a 5-8 mm stub in the melt zone. When the next color tries to push that stub through, it deforms and chews up in the gears.

1. Preventive — once a month: Settings → Device Self-Check → Input Shaping → Calibrate. This recalibrates cutter position and belt tension.
2. After every filament swap, peek through the extruder window — make sure the stub left the melt zone and didn't get parked in there.
3. Community workaround: if you print a lot, stay on PLA. PETG and fiber-filled filaments cause jams 2-3x more often.
4. Replace the cutter blade every 5 spools of PLA/PETG/ABS, and after every spool of fiber filament (PLA-CF, PETG-CF, PA-CF). Blades wear fast.
5. When jammed, follow the official wiki: 4 nozzle cover screws → 3 cables → 3 extruder assembly screws → split the housing → cut the filament in the middle with side cutters and pull from both sides.
6. If reassembly behaves oddly, check both cable channel covers are seated and the cutter push rod springs back. If not — reseat it.
7. Universal clog troubleshooting for any printer: see our general nozzle clog guide.

3. Firmware 1.1.0.56 kills the part cooling fan

In the forum.creality.com thread, Hi owners report that after updating to 1.1.0.56 the model cooling fan stops working. The cherry on top: the changelog calls it «Optimized fan control logic». Version 1.1.0.60 doesn't fix it — Creality calls that a «workaround». Prints continue but with no part cooling: overhangs droop, bridges fail, quality is trash. The printer doesn't auto-notify about updates — you have to download them from creality.com — so the easy fix is just not installing the broken version in the first place.

1. Grab stable 1.1.0.50 from creality.com → Support → Creality Hi Combo → Firmware → Older versions.
2. Drop the .img or .bin file into the root of a FAT32-formatted USB stick. Not into a subfolder — root only.
3. Power off the printer, plug in the stick, power on.
4. On screen you'll see «Update firmware found, install?» — confirm. The printer reboots twice; don't pull power.
5. Once it's back up, run a test Benchy. The cooling fans should spin from layer 1. If not — repeat from step 1.
6. Before any future update, check the «last firmware for HI» thread on forum.creality.com first. Don't push blindly.

4. FR2849: CFS won't retract — spools won't turn

One of the most common CFS bugs is FR2849 «retract issue, filament cannot be returned to CFS hub». In the CFS Unreliable thread, Matthys writes: «100% of my prints hit this, an 11-hour print took 24 hours due to constant manual intervention». The cause: the CFS rollers can't rotate small-diameter spools (Sunlu — 172 mm, Fil-X — 180 mm). The CFS is designed for spool outer diameters of 195-200 mm.

1. Check the spool first: outer diameter must be 195-200 mm. Smaller spools don't engage the rollers and won't rotate during retract.
2. Community fix for small spools: print a spool rim adapter. MakerWorld has plenty — search «CFS spool adapter». The adapter bumps the diameter into the working range.
3. Inspect the buffer module (Creality CFS Buffer Kit, MF003): open it, make sure no broken stubs are stuck and the buffer spring moves freely.
4. Check the hub outlet: pop it open, find the metal dome switch. If it's stuck down by debris, clean with tweezers. With no filament present, the dome should sit in the up position.
5. Inspect the PTFE between CFS and printer for wear. Ends should be round, not flattened. Replace PTFE every 6 months of active use.
6. Once you've fixed the underlying issue, hit «Retry» on the screen. If it errors again — restart from step 1.

5. TC2854: Input Shaping won't start — filament still in extruder

The TC2854 «filament detected in extruder, affecting cutter calibration» error pops up when you start Input Shaping with filament still loaded. IS on the Hi runs three stages back-to-back: auto belt tensioning, cutter position calibration, and vibration compensation. Cutter calibration needs the extruder completely empty — otherwise the feed sensor trips.

1. If the filament is from the CFS — tap «Retract» on the Filament screen and wait for it to return to the CFS.
2. If it's from an external spool — tap «Retract», then manually pull the filament after the retract succeeds (the runout sensor won't free it on its own).
3. If retract fails with «unloading failure» — Settings → Motor → Unlock motors. Push the extruder by hand into the cutter push rod to slice the filament.
4. If there's a broken stub inside and retract refuses — run the «clogged extruder» procedure from section 2 (full disassembly), pull the stub, then start IS.
5. Start IS: Settings → Device Self-Check → Input Shaping → Calibrate. The printer runs all three stages, ~15 minutes.
6. Only run IS from a completely empty state. Best moment — right after loading a new spool, before the first print.

6. Wavy walls and ringing — unsolved on new units

In the «I'm going crazy with this problem» thread, an Hi owner describes wavy walls on simple geometry — cylinders, cubes. Circles print as polygons. They've tried everything: speed, accel, walls, infill, flow, Pressure Advance, drying, OrcaSlicer, coasting, arc fitting — nothing works. A second user confirms the identical defect on a brand-new printer out of the box. It's an unsolved batch issue — likely a combination of the inertia of the 26x26 cm bed and insufficient frame stiffness.

1. Run Input Shaping (Settings → Device Self-Check → Check Input Shaping) — check the resonance frequencies in the log. Below 25 Hz on Y means the frame isn't stiff enough.
2. Check the nozzle: sometimes it's only finger-tight. Heat to 240°C and tighten with a 7 mm socket wrench (firmly but don't overtorque).
3. Wiggle the hotend carriage by hand. Any free play in the rail means you need a new guide+bearing kit.
4. In the slicer, enable «Don't slow down outer walls» under Cooling. Set outer wall speed to ≥120 mm/s (per the official wiki).
5. Check Y-belt tension — the belt should deflect 5-7 mm when pressed in the middle. Too tight = resonance, too loose = skipped steps.
6. Loosen both Z screws, let the bed settle on gravity, then retighten evenly in a cross pattern. A skewed bed causes Z-binding.
7. If nothing works — file a warranty case via support@creality.com with defect photos and logs. Universal ringing/layer-shift troubleshooting: our general guide on ghosting and layer shift.

7. Nozzle scratches PEI on the purge line — stock Z-offset is too low

On the forum, Hi owners pile up complaints: the nozzle gouges the PEI on the purge line, the extruder skips, the first half of the prime line doesn't extrude. The auto-leveling strain gauge calibrates Z to nozzle-on-bed contact — but the purge prints ~50 µm lower than that. On newer batches of stock PEI, the epoxy layer is thinner than the engineer assumed, and that's enough to cause damage. Fix: bump Z-offset up by hand.

1. The main fix: bump Z-offset by hand. Settings → Auto Leveling → Z-offset → set +0.225 to +0.350 mm. +0.250 is a safe starting point for most units.
2. Alternative via Fluidd: open http://<printer-ip>:4408 → Tune → Calibrate → Bed Mesh + Z Offset. You see the real bed geometry there.
3. Before each auto-leveling, clean the nozzle: heat to 240°C and brush off residue with a brass brush.
4. Place the printer on a stable, vibration-free surface. A wobbly desk causes 0.05-0.1 mm leveling errors.
5. If the PEI already has a deep scratch — flip or replace the plate. The double-sided PEI gives you 2 cycles of life.
6. Alternative to stock PEI: the double-sided epoxy resin plate. Epoxy forgives a slightly low offset and won't gouge under the nozzle.

8. Filament cocoon around the hotend — aftermath of a clog

If you don't catch a clog in time, molten filament starts leaking out the gap between nozzle and heater block. On the Creality Hi this is especially nasty: the cocoon wraps around the nozzle cover, drowns the extruder PCB, and chokes both 5015 part cooling fans. Removing the nozzle cover with a fully baked cocoon is nearly impossible without breaking it — so most owners just sacrifice the cover.

1. Remove the nozzle cover. If it's heavily glazed — sacrifice it (the risk of damage trying to peel it off is higher than the cost of a new cover).
2. Heat the nozzle 20°C above the filament's recommended print temp: PLA → 250°C, PETG → 270°C, ABS → 280°C.
3. Wait 5-8 minutes. With heat-resistant gloves, rock the cocoon with pliers — peel it off in chunks, starting at the edges.
4. Drop temp to 30°C via the UI. If the pipe fan is gummed up, help cooling along with a hairdryer on cold setting.
5. Use a wrench or screwdriver to push the cutter and slice off the leftover filament.
6. Remove the hot end via 2 screws. Carefully extract thermal cables — yellow glue holds them, don't yank.
7. Clean the hot end PCB and pipe fan mechanically — no solvents. Alcohol spreads onto the board and can short the traces.
8. If the hot end is damaged, replace the heater block. After reassembly, always: Input Shaping + Auto Leveling, otherwise Z-offset will drift.

9. Extruder gear bearings die after 2 months

A buyer on the Russian retailer DNS writes: «After two months of use the bearings in the feed gears died, thank goodness aftermarket Chinese ones are available». That's the typical fate of the high-flow extruder — three gears push the filament hard (to feed the Unicorn nozzle) but the stock bearings are spec'd for moderate hobbyist use. With daily printing they fail at 500-700 hours. Symptoms: grinding noise on feed, under-extrusion despite correct settings, visibly wobbling gears.

1. Preventive — once a month: open the extruder, brush dust and filament debris off the gears. If you use compressed air, hold the nozzle 30 cm away so you don't pack dust into the bearings.
2. If you hear grinding, remove the extruder per section 2 and check all three gears for play. Spin them with your fingers — they should turn smoothly, no crunch.
3. Replace via the Creality Hi Extruder Kit — includes all three gears with bearings, guaranteed compatibility.
4. Russian community favorite alternative: aftermarket «improved» bearings on AliExpress. Search «Creality Hi extruder bearings» — cheaper, longer life with proper grease.
5. When replacing, lube the new bearings with lithium grease (e.g. Mobil XHP 222). Don't use WD-40 — it strips the factory grease and the bearing dies in a week.
6. After reassembly: Input Shaping + flow calibration in Creality Print. New gears can have a slightly different feed coefficient.

10. Cutter doesn't return — filament won't slice

The Creality Hi cutter should spring back after each slice. If it doesn't, the next color swap hangs and TC2854 may pop up during IS. Three usual culprits: a stub jamming the cutter slot, a loose magnet on the cutter mounting, or wrong-side-up reinstallation.

1. Check for a stuck filament stub in the cutter slot — usually a pinch of PLA. Pull it out with tweezers.
2. Open the cutter mounting and verify both magnets — one on the inner wall, one on the cutter end. Without them there's no spring action.
3. If a magnet fell off, glue it back with cyanoacrylate (super glue). Degrease the contact surface with isopropanol first.
4. Verify cutter orientation: blade holder notch facing DOWN. The wiki shows the correct position.
5. After reinstall, run IS calibration to recalibrate cutter position. Without it, color swaps cut at inconsistent stub lengths.
6. If nothing helps — replace the cutter (Replace Creality Hi Cutter in the parts list). Keep 2-3 spares on hand, especially if you print fiber.

11. Loud metal wiper during purge

The nozzle wiper strips on the Creality Hi are a metal plate — chosen for durability and high-temp resistance. But the dry metal-on-metal contact during purge generates a sharp screech that Tom's Hardware described as «audible from the next room». On a long multi-color print with dozens of color changes, that becomes a problem.

1. Lube the wiper with silicone grease in a thin layer — the Creality Grease Glue Stick works. Don't use lithium grease or WD-40 — they burn off after one 200°C cycle.
2. Replace the wiper plate at the first sign of wear — deep grooves from the nozzle. Spare: Creality Hi Nozzle Wiper.
3. In the slicer, reduce the number of color changes — group colors by layers (vertical sort) instead of by object.
4. Community alternative: print a TPU wiper-mod strip from MakerWorld and stick it on top of the metal. Noise drops 60%, lifetime drops too.

12. Massive filament waste on multicolor purge

Any single-nozzle multicolor system is a purge tax — every color swap forces the previous color out through the nozzle. The Creality Hi's high-flow Unicorn nozzle has a longer melt zone than a stock V6, so its purge is bigger too. Tom's Hardware noted: «on a complex 4-color print, purge waste can match the model's own weight». It's not a bug, it's the math — and you can shave it down in the slicer.

1. In Creality Print: Filament → Filament Settings → Purge volumes — drop from the default 700 mm³ to 350-450 mm³. Tune incrementally: if you see leftover color bleed at the boundary, bump it back up.
2. Object Settings → «Print Wipe Tower» — turn it on. Otherwise the purge dumps right next to your model.
3. Group identical colors by layers (vertical sort). The «Purge volumes per filament change» panel in Creality Print shows the swap count — keep it ≤30.
4. Print multiple objects from the same set together — the wipe tower amortizes over all of them.
5. Use dark colors as a «sink»: dark gray or black hides incomplete purge better, so you can dial volumes down further.
6. MakerWorld has Filament Saver mods that split the wipe tower into segments — saves up to 30% off the standard purge volume.

13. Heat-break clog — separate from extruder clogs

On the Hi, a clog can sit in two places: in the extruder itself (gear zone) or in the heat break — the narrow tube between heater block and melt zone. Symptoms look the same (no extrusion), but the cleaning procedure is different. Heat-break clogs clear through the nozzle with a hot needle, no full extruder teardown required. The Creality wiki documents this as a separate procedure.

1. First retract the filament: Prepare → Filament → Retract. Wait for the nozzle to cool, power off.
2. Remove the hotend cover (4 screws), unplug 3 cables, undo 3 screws, lift out the extruder and disconnect the PTFE tube up top.
3. Power on, heat the nozzle to 240°C (for a PLA clog). For PETG — 260°C.
4. Try a thin needle (the bundled one or 0.4 mm wire) through the nozzle. If it won't go through — heat the tip with a soldering iron or lighter until red.
5. Push the hot needle into the nozzle and hold for 30 seconds — the needle cools down, the molten plastic around it solidifies onto it. Slowly pull the needle out — it pulls the hardened lump along.
6. Set temp to 30°C, wait for cooldown. Reassemble in reverse order.
7. Run Auto Leveling and a test print. If flow is back — heat break is clear.

14. FR2836: feed sensor dead on a brand-new printer

Some units arrive with a dead feed sensor: when you load filament, the blue filament-detector LED doesn't come on, the filament moves a couple of millimeters and stops. On 3DToday a Hi Combo owner writes: «the LED won't light, connecting to the CFS triggers FR2836, heating the nozzle and toggling the lever doesn't help». It's a factory or shipping defect — fixed by reseating the ribbon cable, or by warranty.

1. Pop off the nozzle cover, find the 4-pin filament-detector ribbon micro-connector on the extruder PCB. Unplug and reseat — sometimes shipping vibration unseats it.
2. Verify the blue detector LED comes on when you press the lever by hand (no filament). If not — the detector board is dead.
3. If the detector only triggers on feed — when CFS is connected, check that the RFID reader is seeing the spool. Without RFID confirmation the CFS won't feed.
4. If nothing helps — open a warranty case via the dealer. Describe «brand new printer won't feed, FR2836 with CFS» — this is a known issue Creality acknowledges.
5. Don't update firmware to fix this — it's hardware, not software.

15. Black/unlit screen on power-on

On power-on the screen stays dark, while the fans spin and the motherboard chimes. The Creality wiki points to two main causes: a poor screen ribbon contact, or actual screen damage. The first is a 5-minute fix, the second means a Touchscreen Kit replacement.

1. Unplug the printer. Open the bottom cover (screws underneath), find the screen ribbon — it goes from the touchscreen to the motherboard via a wide flat connector.
2. Unplug and reseat the ribbon at both ends. Inspect the contacts — not bent, not oxidized.
3. Power on — if the screen lights, the contact was the problem.
4. If still dark, open the motherboard cover and check the indicator LEDs. Per the Creality wiki: «one LED solid, one blinking» is normal. If neither lights — motherboard is dead.
5. If the screen is physically damaged (cracks, smears) — replace the Touchscreen Kit. Part number in the wiki parts list.
6. The printer still works in this state: connect via Fluidd at http://<ip>:4408 and continue printing without the screen.

16. Factory QC: extruder motor screws not tightened

Creality's QC on new Hi batches has been spotty. On forum.creality.com Nathan reports: «filament just won't feed». Three days of digging revealed the extruder motor screws weren't tightened from the factory. Not over-torqued, not stripped — just not screwed in. Plus some units ship with stripped nozzle-cover screws from over-torque on assembly. 5-minute fix, but you have to know it's a thing.

1. Pop the nozzle cover. Tighten every nozzle cover and motor protection cover screw (2 each) — torque «fingers + half a wrench-jaw».
2. Verify the three screws holding the extruder motor to the body — most common offenders.
3. Verify the three screws holding the extruder assembly to the carriage.
4. If nozzle-cover screws are stripped (threads chewed) — replace with M3×8 hex socket screws and carefully drill out the original remnants.
5. Tighten the Y-belt and the Z screws — they can be loose from assembly too.
6. Document everything with photos — useful for warranty if you find a serious factory defect.

17. Open frame — ABS, ASA and nylon are unreliable without an enclosure

The Hi is an open bedslinger. The spec sheet lists ABS, ASA, and nylon as «compatible». In practice, these materials need stable ~50°C ambient air to avoid warping and layer delamination. On the open Hi you can only print them in a warm room in summer — and even there results are unpredictable. Any breeze (AC, draft) causes warping. Solution — an aftermarket enclosure.

1. PLA, PETG, TPU 95A+ — open frame is fine. No enclosure needed.
2. ABS, ASA, PA, PC — enclosure required. Off-the-shelf option: Creality Ender Fireproof Enclosure 550×650×750 mm — designed for the Hi and V3 series.
3. DIY enclosure: PVC pipe frame + foil-lined fabric cover. Budget around $20-40. Leave a top vent for thermal flow.
4. The enclosure goes over the Hi — the body plus gantry fit. Leave room for the CFS on the side and a PTFE pass-through.
5. When running ABS/ASA in an enclosure, you must also have room ventilation. ABS emits styrene, ASA plus UV produces peroxides. Details in our fumes and ventilation guide.

18. No manual bed-leveling adjustments

The Hi has no thumbwheels or screws under the bed — only software compensation via bed mesh. This simplifies assembly but gives a downside: if the surface under the printer is uneven or the bed itself is warped beyond ±1 mm — software comp can't catch up. A DNS reviewer writes: «the bed has no height adjustment, so any unevenness can't be played around. Pick a flat surface for the printer».

1. Pick a flat surface. Ideal — a stone slab or thick plywood on a rigid table. Not a windowsill, not a folding card table.
2. Bubble-level it: water level shouldn't drift.
3. If the floor itself is sloped — use adjustable silicone pads under the printer's feet (Creality Shock-Absorbing Silicone Pad).
4. Open the mesh via Fluidd: http://<ip>:4408 → Bed Mesh. Top-to-bottom range should be ±0.5 mm. More than that and the bed is significantly warped — needs replacement.
5. Software compensation works on ±1 mm. If the map shows more — replace the bed (Creality Hi Hot Bed Plate Kit) or just the PEI plate if the warp is in the epoxy.

Creality Hi error code reference

Hi shows errors as a code with a short description. Most codes are searchable directly in the Creality Wiki. The most common ones and the quick fix below.

Generic 3D-printing problems

Beyond the Hi-specific issues, you'll also run into the usual FDM problems. We've covered each in a dedicated guide:

• Nozzle clogs — causes, prevention, cold pull for every hotend type
• First-layer adhesion — Z-offset, PEI, glass, bed temp, primers
• Ghosting and layer shifts — Input Shaper, belts, rails, speeds
• Stringing and oozing — retraction, temperature, drying, travel speed
• Under- and over-extrusion — flow calibration, Pressure Advance, gear wear
• Warping — enclosure, bed temp, brim, materials that fight warping
• Printer maintenance schedule — what to clean, lube, and check, and how often

We also recommend: how to dry filament, filament selection guide, ventilation and health in a print room.

FAQ