Also a 2.4 owner, I bought the 350 LDO kit from Fabreeko and it was delivered back in August. Getting it assembled and dialed in was certainly a process, but aside from that it’s been an absolute workhorse (I think I’ve got something like 200+ hours of print time in; completely blows my Thessian Ender out of the water in terms of both speed and reliability). You certainly can tinker with it and make it a project printer, but they print really well stock. The only mod I’d say is anywhere near required is swapping out the magnetic bed meshing sensor, only because the sensor readings tend to drift as the sensor gets hot. You can totally work around it, by waiting for the printer to warm all the way up or cool down to ambient before printing, but I’m impatient plus the mouse switch mod (Klicky) tends to be more reliable and accurate (plus it’s temperature agnostic).

Don’t get me wrong I’ve totally modded mine: swapped out some of the plastic parts for metal ones, added a brush to clean the nozzle before my print (makes for more consistent Z heights), replaced the panel clips with snap latches, but none of it was required to make the printer print better (mostly just to make maintenance easier and partly because it looks cool).

The new hotness in the open source MMU space is ArmoredTurtle’s BoxTurtle project, which seeks to be an open source equivalent of the Bambu AMS. I’m still working on the parts for mine, but from everything I’ve seen the build is way less fiddly (and as a result more reliable) than the ERCF.

Seconding kit Vorons. While they certainly aren’t the cheapest option, they aren’t that much more expensive than other higher end core XY machines. Fabreeko* has the 250/300mm Trident kit at 1.2k and 350mm 2.4 at 1.4k + an extra $150 or so for printed parts. Compared to the new Core One at between 950 - 1.2k or the X1C also at 1.2k you’re looking at an extra $150 to 350, but that also comes with build volume increases (both the Prusa and Bambu are at roughly 250 mm³). Definitely wouldn’t recommend them as a first printer, but Vorons are shining examples of what’s possible with open source (and they’re absolute workhorses too).

* Highly recommend them with glowing praise for being all around fantastic (they also run sales on the regular, though kit deals are usually reserved for special occasions like black Friday, or Clee day)