I’ve been following it along in the Discord since @bitingmidge mentioned it, now the first version has been released. Find it here:
I am probably going to build it next year. 
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What are the benefits of that extruder over the prusa one?
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Compared to the MK3, it’s faster.
It’s also for the people who have leftovers from the Core One upgrade from the MK4S. It uses those parts. 
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Compared to the mk3 anything is faster?
Out of curiosity how much would it cost to use Prusa parts?
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If you just convert the MK3 it’s not that expensive, if you need to buy stuff to replace what you took from the MK4S it becomes expensiveish. 
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I’m still trying to work out why I’d do it. In the end I end up with a Mk3 that isn’t supported by anyone - I could have saved a lot of time and money if I’d just kept the Mk3 and not upgraded 4>4S>CoreOne! 
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Kind of. The upgrade route was the cheapest though. Also, nobody forces you to do it. It’s mainly a fun project.
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I definitely did not want to discourage you. Doing it for fun is a fine goal. Being able to have a higher performance printer at the end is even better.
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No worries, I have a bin of spare parts at the moment with no use. So it’s an easy choice. 
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Pretty easy drop-in of PrusaWire Core-XZ gantry on an MP3DP V2:
Blue Parts, and a few new holes in top of front frame for the top idlers and counter-balancer.
Y plate change is not a must-do, but changing bearing hole pattern offsets will maximize print volume.
(The MGN12 Y-rail is something I did to mine a while ago when my Y bearings started getting sloppy - not necessary.)
I was already trying to put a Stealthburner on mine via a MGN X rail, maybe I’ll pivot and do this while I’m at it.
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Man, this is great! I want to see how it looks in the end.
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So if someone had a crappy i3 clone (think very cheap version of reality) - what bits would be needed to turn it into this? (Asking for a grand daughter) - maybe I should just get her a mini and be done with it?
I like thise mgn rail additions. The X was the weakest link in my mp3dpv2.
I’d say: Check the instructions on printables. It is really only recommended for people who want to tinker and who don’t care too much about an actually “useful” product. Started off as an April’s fool…
I’d just get the Mini in that case. 
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Tinker is my main intent.
I ended up with Flashforge AD5M for when I want to just hit print, but I can’t seem to give up on my MP3DP V2 - it still works as (nearly) as well as ever.
The MGN Y rail was easy and helped a lot, though simply replacing the the LM8UU bearings and rods probably would have been just as effective - it was rock steady when new.
My X rail LM8UU bearings went too. I had lubed them, but probably not with great oil and they got both sticky and loose at various positions. I did put an MGN X rail on it prior to seeing this. It cleaned up X movement, but I must have had a spacing issue that was creating Z-banding.
The Core-XZ eliminates the threaded rods and should help with that.
My Titan (clone) extruder is worn severely and nearing end of life, so instead of trying to attach it, I’ll probably use a Stealthburner as shown.
The Stealthburner is interesting project in and of itself. Almost too many extruder and hot-end combinations too choose from just within that. There is also a DragonBurner and AntHead X-Carrier options in the PrusaWire assembly too, which just creates an full-on overload of options.
I am going to put a FilamATrix (Filametrix derivative) on it with a Bambu X1C hotend and see what happens. It has a filament sensor before and after the extruder and a filament cutter with the intent of being a platform to mess with an MMU.
The PrusaWire X-carrier has a spacer block between the MGN carriage and the rest of the carrier that pushes the whole Stealthburner assembly pretty far forward. I already took 20mm out and I think there is another 10mm to be had - that is why there are a couple of “blue” parts in the original picture. I think the only benefit is to make room for an inductive Z-probe, but there are other options that don’t require that compromise.
I believe there is an Ender adaptation version out there too.
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Not for me then, that’s what my cnc and laser stuff is for - I need my printer to print without thinking!
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A worthy motto!
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