IR-Sensor IR Filament Sensor with Steel Ball, Magnets, Screws Kit for 3D Printer Prusa i3 mk2.5/mk3 to mk2.5s/mk3s Upgrade

The filament sensor works actually quite well, although there are some quirks in Marlin, that have to be fixed. They relate to the filament change. Logically you would use the unload feature to place a different color filament. If you do that in Marlin, youll be sorry. The firmware does not know how to continue and you may find the nozzle to continue half a mile above the object. However, if you use the extrude function, you may have better luck. Aside, the sensor does what it is supposed to do!

This also was not damaged work perfectly good

This worked will on the Prusa MK2 to MK2.5S upgrade with the Rambo 13a board. There were slots on the board for the connectors. It is nice to have an autoload feature on the printer. Fit very well into the printed extruder housing and all the parts are in this kit for the upgrade.

Great sensor for Prusa machines. Highly recommend.

I am building a Prusa i3 MK3S by self-sourcing (rather than buying prusas kits) just for the fun and experience of buying, and selectively upgrading as I go alone - however, the MK3S extruder has a specific type of sensor and magnetic spring setup that would be prohibitive to try and piece-meal if it wasnt for this kit. Its absolutely perfect, and on testing, does exactly what it should. Five star!

I have an orginal one from prusa as well. This one works the same no problems so far. Used up all my left spool filament just to test. Working as intended.

At the end of the day this product works. My two big issues were that I was missing some long bolts(maybe I lost them). I was able to find them in the Prusa spare parts bag. The second was I used a black PETG. The sensor was not triggered by the PETG plastic flag. I ended up putting a small piece of metal duct tape on the PETG flag so the sensor would see it. Everything else worked like a dream. I am happy.

After my old MK3 sensor literally burned up, I got this kit. I printed all the new parts and assembled everything without issue. I now have an MK3S! I hope the sensor is better than the old one. Time will tell.

It seems to be a good replacement for the original sensor that came in the printer. I installed it and fixed the false filament out errors.

All the needed parts, for a fantastic price. This works 100% on my Prusa i3 MK2.5S+, which Id just upgraded from a MK2/S. All the parts (magnets, ball bearing, sensor, harness, and screws) were included, which really saved me a lot of time sourcing that stuff. One thing: My sensor did not work, until I switched the white wire (on the 5 slot connector side) from pin 5 to pin 4, as others mentioned (and you can also google Prusa IR sensor pinout to verify!) Once I switched the white (sensor) wire from slot 5 to slot 4 in the connector, and plugged it in, it works 100%.