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Small black filament sensor module with cable attached

LONGER

LONGER Breakage Detection Sensor for LK1 LK4 LK4 Pro Alfawise U20 U30 U30 Pro 3D Printers Accessory

SKU CH-R0GH-0WWBN

Detects filament breakage on LK1, LK4, LK4 Pro, U20, U30 and U30 Pro printers to pause prints automatically

  • Prevents failed prints by detecting filament run-out
  • Works with LK1, LK4 and LK4 Pro models
  • Compatible with Alfawise U20, U30 and U30 Pro printers
  • Original sensor ensures reliable detection and easy replacement

Compatible Breakage Sensor for Longer LK Series

This original breakage detection sensor fits Longer LK1, LK4 and LK4 Pro printers. It also works with Alfawise U20, U30 and U30 Pro models. The part restores filament run-out detection so prints do not fail silently.

Low-Power Sensor Operation

The sensor draws minimal current from the printer control board during normal use. It adds no audible noise and generates no measurable heat. Installation simply reconnects the existing cable without extra power requirements.

Highlights

  • Prevents failed prints by detecting filament run-out
  • Works with LK1, LK4 and LK4 Pro models
  • Compatible with Alfawise U20, U30 and U30 Pro printers
  • Original sensor ensures reliable detection and easy replacement

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the breakage detection sensor on my LK4 Pro, and which step is commonly missed?

Connect the sensor cable to the filament-runout port on the mainboard, route the filament through the sensor housing, then enable filament-runout detection in the printer firmware — the step often missed is turning the feature on in the menu after wiring.

What maintenance or replacement will the sensor need over time?

The sensor has no moving parts; keep the filament channel clear of dust and snipped filament tips, and replace the unit only if the lever fails to trigger or the connector pins become damaged.

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