Well I’ve now got an “S” - it doesn’t go yet, because it took a lot longer to put together than I expected. (Mostly because of interruptions, which led to me worrying when there was a part left over!
I’m pretty sure it came from the new bits - it’s the main spacer that sits under the extruder gears, so I know mine is still there, but it does make one’s heart go boom boody boom! 
I don’t care what youtube says, those new parts are really really lovely prints.
Damn, your old part looks shitty. The new part is made from this smoothish greyish material. So having that part left is fine. You should have a lot more parts left actually.
Since I have the MMU, a lot of the changes had already been made before. 
Now design us some fancy 60° overhang parts! 
Pretty please.
I was just going to let her rip, but didn’t want to wake up to a pile of spaghetti, so I used one organic support, and a 4mm brim, because I thought hanging something that large of a single 2mm fillet was probably not sensible!
Given that this is my second print after the upgrade, with just the auto calibration and totally stock printer and slicer profiles, I think I like this printer a lot!
I think if anyone was serious they’d use a few more supports on the tops of those curves and would get a perfect print - as it is this is mostly sensationally good with the flat parts of the curves on the limit. Better pics will follow.
I’ve been thinking quite a lot about the cost of this thing compared to it’s competitors, and I think it’s a bit like any other endeavour - if you are racing cars or boats for instance, squeezing the last fraction of a second out of performance costs as much as building the car.
Looks like you hit send a bit early?
??
Can’t see the pics or is the print a bit rough - or is it the bell that’s missing? That’s a separate part - printed at a different angle to see if it all fits - it does!
Seriously, admittedly the trumpet end is a bit rough (it’s not the final version) but I wanted to see if those 70° overhangs were really achievable. Seems like they are. Printed bell side down so the rough bits are getting close to 85 I reckon.
Your post ends with:
“Given that this is my second print after the upgrade, with just the auto calibration and totally stock printer and slicer profiles, …”
Presumably there was a conclusion to be added there. You’re leaving us in suspense!
We’re not quite that bad.
Ahh, thanks - it’s also the second paragraph! 
I sense a little climate control happening there! The traditional Aussie way of managing climate indoors is to put a jumper on if it’s too cold, or take your shirt off it’s it’s too hot!
This is accompanied by a constant whine about how hot/cold/sweaty one is.
I’m wearing a flannel. 
Never fear - but I won’t be ordering an upgrade kit any time soon!
Ready for the Future
With Exceptional Backwards Compatibility
When you buy the CORE One, you’re investing into a platform that will continue to grow over time, rather than something that you’ll have to replace in a year or two. Prusa printers are well known for their exceptional reliability, durability and long life cycle. We offer excellent post-launch support with regular firmware and even hardware updates to expand your printer’s capabilities even years after launch. And when a new machine comes out, we publish an upgrade kit.
When new tech comes out, it’s usually exciting but it can also be a little inconvenient due to changes. You may need a new charger or a different phone case because the camera has moved. Not so with the CORE One! If you already own the MK4/S, you can reuse many accessories, such as print sheets, nozzles, and hotends. The CORE One uses many proven MK4S parts, which is why we also offer a convenient conversion kit.
Which kit? Why not?
Is this the end of the mk line then? Are there any serious reasons for maintaining a bed slinger branch anymore?
He didn’t say it like that, he said “beside each other” kind of. But I think that might have been it in the long run. They opened the ugrade path from the 3 → 4 → 4S → Cube. So noone can tell them they’d leave anyone behind.
Indeed. Good thing I’ve been too busy to pull the plug and order the s+MMU3 upgrade!! 
You need the S upgrade to upgrade to the Core. And the MMU is compatible, seems you screw it to the back of the box. Might have to change the height of my setup because the box seems higher.
I’ve read several places that the S isn’t necessary. But who knows, I guess the dust has to settle a little…
Their website literally says so.
