I’m looking to print large-scale prints using ASA and other unsafe materials, so ideally I need something that has an enclosure or can be enclosed easily, but I’d rather buy something preassembled or partially-assembled as I don’t have time to build a RatRig.
Option 1: Like others mentioned scaling up those printers is possible. One thing: You might want is a laser cut aluminum top plate instead of item profiles and don’t use a carbon fiber gantry: the thermal expansion of the gantry and frame should be similar so milled aluminum is an option.
Some companies offer build services for these projects/printers.
2: Prusa XL is 360x360mm and prebuilt. The shipping date is early next year.
3: Used industrial printers. Expect prices between $1.5k-3k. Check that the maintenance cost is reasonable; it prints with generic 1.75/2.85mm filament and you like the slicer as not all of them work with prusaslicer/cura.
If there is a bankruptcy auction near by it could be worth going there (total cost is often bid + 2-5% fee; sometimes 10% down + net 7). The downside is you buy them as seen meaning no function test and no guaranty.