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%.

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!

Was able to hook this up to my Duet board with ease. Works as it should, and fit an MK3S hotend.

I followed the instructions to upgrade the mk3 to mk3s and the s requires a shorter ptfe tube which is not included.

i have a am8 frame like the bear frame for prusa i am part hunting to make my anet as much a prusa mk3s as possible and this works i did have some firmware issues that i had to work out on my own like the #define FIL_RUNOUT_STATE HIGH norm is low by default its like the true/false for like everything else that why it took me 2day to find it while working on other things hope this help someone else so they dont waste time not printing

This also was not damaged work perfectly good

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!

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

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.

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.