MMU2S R2 Selector FINDA remix with magnet

This is a remix of the MMU2S Selector FINDA version R2 (improved blade holder mentioned in release notes for Firmware 3.9.0) with a slot for a 6x2x10 magnet for improved FINDA reliability.
(The magnet used is the smaller of the magnets included with the MMU2S kit for the MK3S extruder.. you probably have one in your spares bag - you'll also need a longer screw, e.g. 18-20mm long, check your spares bag)

There's also a slightly modified blade holder.
I've enlarged the inlet side for the filament path on both parts, this can help guide the filament into the selector.

Apparently the steel balls in the newer kits aren't quite as ferrous (different alloy of stainless perhaps) and might not be attracted by the magnet - you might want to check this before you pull yours apart!

I took inspiration from Sauyri's remix of my first part and made an improved version with a blind hole for the magnet so the hex nut doesn't bottom out on the magnet. There is a small hole through the hex nut channel to eject the magnet if need be, with a paperclip or similar.

SCAD files included, this remix is based on this Prusa3D github commit

You'll also need the matching front PTFE holder (also included below) if you don't already have it. As this release of parts has been around a while now, you might already be using it… I believe the farm printed part would be marked M2.

Print instructions

I print this with 0.2mm layers and 4 perimeters using the stock Prusament PETG profile.
There is a minor flaw in the original model, turn on Detect Thin Wall in Print Settings to avoid - however it is small and mostly covered by the delrin nut, so is not really an issue if you don't.