Right now I have MK 4, MK 3S+, MK 3, MK 2.

When I started poking at Grid Infinity setups it sort of let me know I needed something a bit
bigger for the larger projects.

I plan on upgrading one of the MK 3 setups to MK 4, and stuff it into an enclosure to aide in
printing with material that requires more TLC like Ninja flex, and ASW. The XL with max
print heads is a bit on the pricey side, and you really need to build it / set it up in its
forever home. Right now the XL is best at multi-head setup so that hardware is
still on my buy list.