# Best Filament Runout Sensors to Save Failed Prints (2026) Source: https://filamentprintlab.com/best/filament-runout-sensors Updated: 2026-10-20 Publisher: Filament Print Lab. Our score is an editorial rating out of 10 (fit 35%, features 25%, build 20%, value 20%), not a customer rating. Method: https://filamentprintlab.com/how-we-research#our-score Detection method and compatibility lead the decision. Simple mechanical switch sensors trip when filament runs out, while smart motion sensors also catch jams and grinding by detecting that filament has stopped moving, not just that it is absent. Check the filament diameter it accepts, usually 1.75mm, the mounting and PTFE fittings, the signal voltage, and whether your board and firmware support a runout pin and the pause-and-resume workflow. These guides help anyone running long prints or nearly empty spools, where a mid-print runout wastes hours of work and material. Multi-day and large-format printers benefit most from the insurance. A practical tip: a motion-based smart sensor is worth the extra cost, since it also catches clogs and grinding that a basic switch misses entirely. Confirm your firmware supports runout detection and a clean pause before buying, and mount the sensor so filament feeds through smoothly without adding drag that could cause under-extrusion. ## Picks ### 1. BIGTREETECH SFS V2.0 Smart Filament Sensor, Support Klipper/Marlin/RRF, SKR Mini E3/Octopus Our score: 8.6/10 (Fit for the job 9/10 · Features and specs 9/10 · Build and materials 8/10 · Value 8/10) BIGTREETECH SFS V2.0 smart filament sensor supporting Klipper, Marlin and RRF with SKR Mini E3 and Octopus boards. Pros: - Klipper, Marlin and RRF support fits almost any firmware setup - Plugs easily into SKR Mini E3 and Octopus sensor ports - Motion-based detection catches clogs as well as empty spools Cons: - Stock printer boards may need adapter wiring to connect - Sensitivity settings require tuning to avoid nuisance pauses Details: https://filamentprintlab.com/product/B0C77J36T3 ### 2. BIGTREETECH SFS V2.0 Smart Filament Runout Sensor, Bi-Directional Photoelectric, 1.75mm Our score: 8.4/10 (Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 8/10) BIGTREETECH SFS V2.0 smart filament runout sensor with bi-directional photoelectric detection for 1.75mm filament. Pros: - Detects both runout and filament jams by tracking movement - Bi-directional design works with retractions without false alarms - V2.0 revision improves on the original SFS module Cons: - Needs firmware configuration and a free sensor port on the board - Adds a small amount of friction to the filament path Details: https://filamentprintlab.com/product/B0C77QS4TS ### 3. 3D Printer Smart Filament Sensor BTT SFS V2.0 Break Detection, for Ender 3/Voron Our score: 7.8/10 (Fit for the job 8/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10) BTT SFS V2.0 smart filament sensor with break detection, listed for Ender 3 and Voron printers. Pros: - Listed Ender 3 and Voron fit covers popular DIY and stock printers - V2.0 motion sensing detects breaks and grinding jams - Helps save long Voron prints from silent under-extrusion Cons: - Reseller listing, so check it is a genuine BTT unit - Voron installs usually need a printed mount and cable routing Details: https://filamentprintlab.com/product/B0FFBQRM43 ### 4. Creality Official Ender 3 V3 SE Filament Runout Sensor, Smart Filament Sensor Break Detection Module Detector for Creality Ender 3 V3 SE/Ender 3 V3 KE 3D Printers Our score: 7.6/10 (Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10) Creality Official filament runout sensor for the Ender 3 V3 SE and V3 KE, a break detection module for 1.75 mm filament with a metal filament guide. Pros: - Built-in metal filament guide with a smooth surface to reduce friction as filament feeds in. - Blue LED stays on while filament feeds and goes out when filament runs out. - Official Creality part for the Ender 3 V3 SE and V3 KE, with 1.75 mm filament support. Cons: - Listing names the Ender 3 V3 SE and V3 KE, so it is a poor fit for other boards without checking. - Basic runout and break detection only, with no jam or clog detection described. Details: https://filamentprintlab.com/product/B0CP5ZFCGN ### 5. BIGTREETECH SFS Smart Filament Sensor 1.75mm Runout/Break Detection SKR Mini E3 V2.0/V3.0 Our score: 7.6/10 (Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10) BIGTREETECH SFS smart filament sensor for 1.75mm with runout and break detection for SKR Mini E3 V2.0 and V3.0. Pros: - Supports both SKR Mini E3 V2.0 and V3.0 board revisions - Runout and break detection guard against wasted print hours - Inline design fits between the spool and the extruder Cons: - Confirm your board revision before ordering this sensor - Needs a clean filament path to avoid false motion readings Details: https://filamentprintlab.com/product/B07ZTM9CSQ ### 6. Antinsky BIGTREETECH SFS V1.0 Smart Filament Runout Sensor Module 1.75mm SKR Mini E3/Manta Our score: 7.0/10 (Fit for the job 7/10 · Features and specs 7/10 · Build and materials 7/10 · Value 7/10) Antinsky listing of the BIGTREETECH SFS V1.0 smart filament runout sensor module for 1.75mm with SKR Mini E3 and Manta. Pros: - Manta board compatibility suits compact Klipper builds - Runout module stops prints before a wasted air-printing session - Works with SKR Mini E3 connectors on upgraded printers Cons: - Third-party seller of an older V1.0 sensor design - Manta and SKR setups still need firmware pin definitions Details: https://filamentprintlab.com/product/B0CWV4VG42 ### 7. 2PCS 3D Printers 1.75mm Filament Break Detection Sensor Module Run-Out Sensor Modules for Ender 3 CR10,Transparent(with 1m Cable) Our score: 6.8/10 (Fit for the job 7/10 · Features and specs 6/10 · Build and materials 6/10 · Value 8/10) Two-pack of 1.75 mm filament break and runout detection sensor modules with a 1 m cable, listed for Ender 3 and CR-10 style printers. Pros: - Pack of two modules, useful for a second printer or a spare. - Funnel-shaped inlet and outlet ports reduce the resistance on the filament. - Stops the printer when filament is exhausted, for 1.75 mm filament, with a 1 m cable. Cons: - Unbranded listing with little detail on voltage, board compatibility or wiring. - Detects runout and breaks only, with no jam detection described. Details: https://filamentprintlab.com/product/B0D3147HPL As an Amazon Associate I earn from qualifying purchases.