Just finished this 9/12/2021. I followed the official MK3S guide in reverse to take the extruder apart and then I followed this guide to build the BNBSX. This guide had me figuring a lot out on my own but once I got the extruder body assembled from this guide, it all made sense. If you built your Mk3S originally, you can do this. Just takes a bit of time. Working good with the stepper online motor recommended in this guide. I didn’t have a black oxide screw for the filament lever for the MMU2S so I’ll have to order for that. all together, it works amazing!
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