Ooooh, the Prusa Mendel i3 MK4 is out! Tomorrow I'll be on a spontaneous road trip over to Prague to check out the MK4 - what burning questions do you have that I need to ask Jo and the team about?
http://go.toms3d.org/MK4
Original Prusa MK4 3D Printer | Original Prusa 3D printers directly from Josef Prusa

The MK4 provides high-speed 3D printing with ease and is ever so reliable like all Original Prusa 3D printers. Worldwide shipping. Buy online today!

Prusa3D by Josef Prusa

@layers I dunno. I feel like the video answers almost all of mine. I'm thinking I'm going to have to save up for the MK3S->4 upgrade.

HOWEVER, they mention a stiffer frame and I can't imagine that is included in the upgrade, otherwise that would be essentially the ENTIRE printer they would be shipping as an upgrade. I would like to see a parts list of the upgrade but I don't yet see one on the upgrade product page.
https://www.prusa3d.com/product/original-prusa-i3-mk3-s-to-mk4-upgrade-kit/

Original Prusa i3 MK3/S/+ to MK4S upgrade kit | Original Prusa 3D printers directly from Josef Prusa

This is the full upgrade that also contains the MK4’s new X/Y precise motors (400 steps, 0.9°per step). It’s the most expensive of all three, but last time you voiced your interest in a full MK2->MK3 upgrade pretty strongly, so we decided to give you a full MK4 upgrade as well. :-)This product is supplied as a kit - you must assemble it yourself!

Prusa3D by Josef Prusa
@3DPrintingDad @layers But does it make sense to upgrade your old MK3s? for just a few more € you can get the MK4 kit and some pepole out the pay a lot for an MK3s.
@falki @layers You've got a good point. If I could get at least $300 for a 5-year-old MK3 (upgraded to an MK3S) that is in great condition, I'd come out ahead and have a fresh printer, should I get the MK4 kit. I'm