Troubleshooting
Pick your problem. Each guide walks you through fixes step by step.
Step-by-step fix guides
Printer offline or not found
Wi-Fi band, router isolation, app mismatch, LAN mode
Does your printer filter the air?
Carbon vs HEPA, what the enclosure really removes, ventilation
First layer not sticking
Clean plate, bed leveling, Z-offset, temperature
Stringing & oozing
Lower temp, retraction, travel speed, dry filament
Layer shifting
Belts, Z-hop, speed, carbon rods, electrical
AMS detection issues
Sensors, RFID, feeder gears, buffer, PTFE tubes
AMS desiccant
When to check it, drying instead of rebuying, which beads
Nozzle too close to bed
Z-offset, factory reset, calibration, test print
Clogged nozzle
Purge, cold pull, needle cleaning, hotend replacement
AMS jamming
Locate jam, clear PTFE, buffer, spool prep, HMS codes
Under-extrusion
Partial clog, flow calibration, temperature, volumetric speed
Warping & bed adhesion
Clean plate, plate type, enclosure, brim, Z-offset
Layer splitting
Temperature, cooling fan, filament drying, layer height
H2D bed adhesion
Corners lift when your X1C prints the same file fine: the uneven-bed fix
OrcaSlicer forgets the LAN code
Bambu access code keeps resetting in LAN mode: the one-field config fix
Bambu Cloud down
Keep printing through any outage: microSD or USB now, LAN mode for next time
Supports welded on or toppling
Rough undersides, floating trees, supports where you did not want them: settings and support filament
Interactive troubleshooter
Not sure what's wrong? This tool narrows it down.
Quick reference
In 2025, Bambu Lab started requiring authorization for network control commands, in cloud and LAN mode, which cut off direct printing from Orca Slicer. SD card printing was unaffected. Developer Mode, inside LAN Only mode, switches the check off.
1. On printer, turn on LAN Only: H2, P2S and X series Settings → LAN Only; P1 series Settings → WLAN → LAN Only mode; A series Settings → LAN Only Mode.
2. On the same LAN Only page, enable Developer Mode (P1: scroll down to find it) and confirm the notice.
3. Note the Access Code and IP address.
4. In Orca Slicer: Add printer → enter IP + Access Code. Done.
Try first: Cold pull. Heat to printing temp, push filament through, cool to 90°C (PLA) / 120°C (PETG), press Retract on the screen and help only lightly by hand. Repeat until clean. If that doesn't work, clean with an acupuncture needle while hot. Last resort: replace the hotend.
Step-by-step clogged nozzle guide → · Extruder maintenance →
Quick fixes: Clean plate with IPA. Increase bed temp. Add brim (5-10mm). Eliminate drafts. For ABS/ASA you need an enclosed printer.
Common causes: Partial clog (cold pull), worn nozzle (replace), dusty extruder gear (clean with brush), wet filament (dry it), wrong flow rate (run calibration).
Step-by-step under-extrusion guide → · Extruder maintenance → · Nozzle replacement →
Cloud mode: Check Wi-Fi password, try 2.4GHz (some printers don't support 5GHz), restart router.
LAN mode: Bambu Studio only lists the printer automatically on the same local network; on a different subnet or VLAN, use Device → Bind with Access Code and enter its IP address and access code (Bambu's access code guide). Disable a VPN on the computer.
Normal: Motor hum, fans, bed movement. Not normal: Grinding, clicking, rattling. Check belt tension, loose screws, carbon rods. Run vibration compensation calibration.
Need replacement parts or tools? Our tested picks · All accessories
Printer showing an HMS error code (like HMS_0700-2000...)? Bambu's official HMS index explains every code. Our guides above cover the cases where the official fix alone doesn't get you printing again.