TriangleLab Filament Runout Sensor

3D printer users relying on continuous prints know that filament runout can cause failed prints and wasted time, especially in complex or long-duration jobs. Without a reliable filament runout sensor, printers may continue extruding air, leading to print defects or complete print failure.

The TriangleLab Filament Runout Sensor is engineered for precise detection of filament presence, pausing your print immediately when filament runs out. Compatible with 1.75mm filament diameter, it supports all filament types including flexible, clear, opaque, and filled materials. This sensor is widely used in DIY and Klipper-based builds, including Voron and Trident printers, where reliable filament monitoring is critical for uninterrupted printing. Operating at 3.3-5V and below 80℃, it integrates easily into existing wiring harnesses and supports daisy-chain connections for multi-sensor setups.

Why Upgrade?

• Prevents print failures caused by unnoticed filament runout on Voron 2.4 and Trident printers
• Supports all filament types including flexible and filled materials, ensuring versatility for advanced users
• Enables seamless integration with Klipper firmware for automated print pausing and filament change
• Daisy-chain capability allows monitoring multiple filament feeds in complex setups
• Protects long prints from wasting time and material due to filament exhaustion

Best For:

• Voron 2.4 and Trident builders requiring reliable filament runout detection
• Klipper ecosystem users implementing automated filament change scripts
• DIY CoreXY and high-speed printer builds needing precise filament monitoring
• Users printing with flexible, opaque, or filled filaments that demand consistent feed detection
• 3D printer owners upgrading from stock filament sensors for improved reliability

Pair With the Right Filament

Ensure uninterrupted printing by pairing this sensor with filaments that benefit from consistent feed monitoring.

• PLA Filament — ideal for everyday prints where runout detection prevents failed jobs
• TPU Flexible Filament — flexible materials require reliable feed detection to avoid jams
• PETG Filament — consistent extrusion monitoring improves print quality with PETG