Best Filament Runout Sensors to Save Failed Prints (2026)
Updated How we research
BIGTREETECH SFS V2.0 Smart Filament Sensor, Support Klipper/Marlin/RRF, SKR Mini E3/Octopus
BIGTREETECH SFS V2.0 smart filament sensor supporting Klipper, Marlin and RRF with SKR Mini E3 and Octopus boards.
BIGTREETECH SFS V2.0 Smart Filament Runout Sensor, Bi-Directional Photoelectric, 1.75mm
BIGTREETECH SFS V2.0 smart filament runout sensor with bi-directional photoelectric detection for 1.75mm filament.
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.
The short version
We compared 7 picks. Our scores range from 6.8 to 8.6 out of 10.
- Best overall:BIGTREETECH SFS V2.0 Smart Filament Sensor, Support Klipper/Marlin/RRF, SKR Mini E3/Octopus. Highest overall score in this guide at 8.6/10.
- Also great value:BIGTREETECH SFS V2.0 Smart Filament Runout Sensor, Bi-Directional Photoelectric, 1.75mm. Value score of 8/10, overall 8.4/10.
- Solid build:3D Printer Smart Filament Sensor BTT SFS V2.0 Break Detection, for Ender 3/Voron. Build and materials score of 7/10, overall 7.8/10.
- Feature-rich: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. Features score of 7/10, overall 7.6/10.
Scores are our editorial assessment, not customer ratings. How we score
- 1.BIGTREETECH SFS V2.0 Smart Filament Sensor, Support Klipper/Marlin/RRF, SKR Mini E3/Octopus8.6/10See on AmazonCheck price
- 2.BIGTREETECH SFS V2.0 Smart Filament Runout Sensor, Bi-Directional Photoelectric, 1.75mm8.4/10See on AmazonCheck price
- 3.3D Printer Smart Filament Sensor BTT SFS V2.0 Break Detection, for Ender 3/Voron7.8/10See on AmazonCheck price
- 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 Printers7.6/10See on AmazonCheck price
- 5.BIGTREETECH SFS Smart Filament Sensor 1.75mm Runout/Break Detection SKR Mini E3 V2.0/V3.07.6/10See on AmazonCheck price
- 6.Antinsky BIGTREETECH SFS V1.0 Smart Filament Runout Sensor Module 1.75mm SKR Mini E3/Manta7.0/10See on AmazonCheck price
- 7.2PCS 3D Printers 1.75mm Filament Break Detection Sensor Module Run-Out Sensor Modules for Ender 3 CR10,Transparent(with 1m Cable)6.8/10See on AmazonCheck price
#1BIGTREETECH SFS V2.0 smart filament sensor supporting Klipper, Marlin and RRF with SKR Mini E3 and Octopus boards.
Fit for the job 9/10 · Features and specs 9/10 · Build and materials 8/10 · Value 8/10
- + 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
- - Stock printer boards may need adapter wiring to connect
- - Sensitivity settings require tuning to avoid nuisance pauses
#2BIGTREETECH SFS V2.0 smart filament runout sensor with bi-directional photoelectric detection for 1.75mm filament.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 8/10
- + 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
- - Needs firmware configuration and a free sensor port on the board
- - Adds a small amount of friction to the filament path
#3BTT SFS V2.0 smart filament sensor with break detection, listed for Ender 3 and Voron printers.
Fit for the job 8/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10
- + 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
- - Reseller listing, so check it is a genuine BTT unit
- - Voron installs usually need a printed mount and cable routing
#4Creality 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.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + 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.
- - 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.
#5BIGTREETECH SFS smart filament sensor for 1.75mm with runout and break detection for SKR Mini E3 V2.0 and V3.0.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + 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
- - Confirm your board revision before ordering this sensor
- - Needs a clean filament path to avoid false motion readings
#6Antinsky listing of the BIGTREETECH SFS V1.0 smart filament runout sensor module for 1.75mm with SKR Mini E3 and Manta.
Fit for the job 7/10 · Features and specs 7/10 · Build and materials 7/10 · Value 7/10
- + 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
- - Third-party seller of an older V1.0 sensor design
- - Manta and SKR setups still need firmware pin definitions
#7Two-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.
Fit for the job 7/10 · Features and specs 6/10 · Build and materials 6/10 · Value 8/10
- + 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.
- - Unbranded listing with little detail on voltage, board compatibility or wiring.
- - Detects runout and breaks only, with no jam detection described.
Before you buy: trade-offs we flagged
No pick is perfect. These are the main compromises we noted for the top products in this guide, so you can check they will not matter for you.
- Stock printer boards may need adapter wiring to connect (BIGTREETECH SFS V2.0 Smart Filament Sensor,...)
- Needs firmware configuration and a free sensor port on the board (BIGTREETECH SFS V2.0 Smart Filament Runout...)
- Reseller listing, so check it is a genuine BTT unit (3D Printer Smart Filament Sensor BTT SFS V2.0...)
- Listing names the Ender 3 V3 SE and V3 KE, so it is a poor fit for other boards without checking. (Creality Official Ender 3 V3 SE Filament...)
- Confirm your board revision before ordering this sensor (BIGTREETECH SFS Smart Filament Sensor 1.75mm...)
- Third-party seller of an older V1.0 sensor design (Antinsky BIGTREETECH SFS V1.0 Smart Filament...)
Frequently asked questions
›What is the best choice among filament runout sensors to save failed prints (2026)?
BIGTREETECH SFS V2.0 Smart Filament Sensor, Support Klipper/Marlin/RRF, SKR Mini E3/Octopus is our top overall pick. BIGTREETECH SFS V2.0 smart filament sensor supporting Klipper, Marlin and RRF with SKR Mini E3 and Octopus boards. It earns our score of 8.6/10, based on fit for the job, features, build and value.
›What is a good budget option?
BIGTREETECH SFS V2.0 Smart Filament Runout Sensor, Bi-Directional Photoelectric, 1.75mm is the strongest low-cost pick in this guide. BIGTREETECH SFS V2.0 smart filament runout sensor with bi-directional photoelectric detection for 1.75mm filament.
›How much should I expect to spend?
Picks in this guide span See on Amazon price bands (roughly: $ = under $30, $$ = $30 to $100, $$$ = over $100). We never display exact prices because they change constantly, so the buttons above always show Amazon's current price.
›How were these products chosen?
We shortlist products that fit the job this guide solves and compare their published specifications, such as size, capacity, materials and what is included. Each pick gets an editorial score out of 10 for fit, features, build and value, and we write the pros and cons from those details. Our score is not an Amazon customer rating. We earn a commission if you buy through our links, which never affects the ranking.
Filament Print Lab independently selects every product; we may earn a commission from links above.
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