BIGTREETECH SFS V2.0 Smart Filament Sensor,Filament Runout Sensor Support Klipper/Marlin/RRF 1.75mm SKR MINI E3/Octopus for Ender 3 FDM 3D Printer

This sensor really saves prints. I tried to print some dragon using Silk PLA and I failed three times due to clogging. I decided to upgrade my printer and install this sensor and for now it paused my prints three times due to clogging but I was able to resume printing after clogging. So I'm continuing to print. Minor issue with sensor - you will need to mount them - I found the custom mount compatible with my print head (ender sprite pro) and printed them. P. S. The above is definitely a filament issue. I printed a lot without any clogging but glad to see I'm able to overcome filament clogging issue with this sensor.

So much better than stock. I have these on two Neptune 4 Max, on which the stock extruder is prone to the blob of death. The sensors detect both runout and filament movement. The Klipper tweak is available on GitHub, the whole thing took two minutes.

These things are terrible. I've got three of them, and NOTHING feeds through them easily. The design on the inside just sucks, it has a tiny hole that filament has to somehow make it through, but filament is curved, and being pushed around by the rollers inside this. You're supposed to hold the lever down with one hand, while trying to force filament in with the other. All three fail to feed constantly. Once you manage to get filament through them, it's fine, but I don't see how anyone can give these good reviews if they actually used them. I'll try and make new housings for them, maybe I can fix their poor design. If you can't do that, don't bother trying these.

Requires a lot of tweaking in your printer.cfg file. Don't have it activated during calibration prints. Looks sick. Great value. Finicky, so you have to tweak bounce back and measure distance

Works very well! I bought it with the expectation that I would have to mod it to work with the Anycubic Kobra S1 and I did. All I needed to do was make the 3 pole switch either HIGH or LOW instead of just open or closed. I then connected the wires to the printer and it worked flawlessly! It took some research and setting up but not as much as I thought it would.

The packaging from Bigtreetech looks great and really stand above other products. I have not installed the filament sensor yet but once I do I’ll come back and update it. So far I’m impressed with the look and feel of the product. I own other products and have been very pleased so far!

I had really high hopes for this sensor. I installed it and initially had pretty good results. Unfortunately, shortly after I installed it, the sensor started throwing all sorts of random errors when printing at higher speed. Multiple prints failed due to the sensor throwing an error saying filament had run out while it clearly still had filament in it. I worked through all diagnostics with BTT, I also completely disassembled the sensor because it was possible some filament dust could have disrupted the sensor. After completely disassembling, cleaning, and reassembling it the sensor worked a little bit better. Unfortunately though it started throwing errors after 1 print. After really trying to make this work I found I could not get a consistent result with this sensor. I had to remove it because randomly failing prints was causing too much frustration for no real value. I would steer clear of this sensor and just build one with an end stop sensor, a ball bearing, and a housing running the filament through it.

Both functions work