I'd love to use the multi material upgrade but I couldn't get it to work. The filament wasn't feeding into the multiplexer... 
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Replying to @3DPrinTek @josefprusa
Make sure you upgrade your slic3r as well. Otherwise, it doesnt understand its multimaterial!
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Replying to @3dprintsbyalex @josefprusa
Used the new slic3r version and the post processor. It's a mechanical issue on the multiplexer - the metal tubes are not lined up exactly
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Replying to @3DPrinTek @josefprusa
Having that same problem right now. Will crack my head on it!

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Have you guys had any luck? I'm having issues with the filament not coming BACK OUT of the hotend when switching filaments in the tower.
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Made two photos so that you can see what I'm talking about. I can move the tubes to be centered but they don't stay in that position...pic.twitter.com/SAuasux2d1
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Strangly enough, all problems are solved by changing some Gcode. Presliced was different then my own mm file export. Very strange!!!pic.twitter.com/D7rEy4rmdQ
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Glad you've got it working... My issue is a sadly not as easy fixed since it's a mechanical thing. The filament can't be pushed in the tubes
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That's what I thought in the 1st place as well. There isnt that much clearance to say it was way off. And now it works. It's a bit strange!
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Have you seen my photos. That's far off and no chance of centering them cause the tubes are very loose... I need to print a new multiplexer
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Weird. My problem is lower than the multiplexer. The filament is ballooning at the tip, about at the point where the heatbreak is.
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Check if the tip of the tube is slightly pointy. A straight flat end doesnt fit properly in the heatbreak so theres a little room there...
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