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

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%.

WARNING: was not wired correctly. The white, signal wire was in the wrong location. Making the item useless until the wire was placed in the right location. Works great after fix was made.

This part worked great. Print your own parts, keep all the screws and this is an identical upgrade to the original.

Works great with my Prusa MK3s

I wish I saw this here before purchasing the upgrade kit from Prusa. Quick back story: Since I bought my MK3 I have never had any luck with their filament sensors working for long. I think I went through 4 in one year. Then they upgraded to the MK3 to MK3S with a new sensor. I upgraded the 1st of June and the new sensor lasted about a month. As soon as I put this new filament sensor in it worked right away. Now time will tell. I see another reviewer mentioned an issue with the cable, I reused the one that came with my upgrade kit.

This worked for me. But the pin out on the 5pin side didn’t match the pictures on Prusa doc. I moved the white wire from pin 5 to pin 4 to match what Prusa manuals show. I bet it wouldn’t work otherwise.

I purchased 3 kits and I MISTAKENLY thought the magnets were not included. They ARE included and just tucked in a slot cut in the foam. Changing review to 5 stars and will buy again.

This also was not damaged work perfectly good

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.

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.