It is FDM. I wish I could do resin for detail, but those materials can't compete with this. The machine use to be an Ender 5 Plus, but there is not much of the original unit now. Aftermarket motherboard, extruder/hotend assembly, z axis ball screws, enclosure, slide bearings, and a lot more. The frame is also heavily triangulated everywhere for rigidity, in order to reach this kind of dimensional accuracy. The filament is a high end PA6-GF, that is really strong and can withstand heat. It needs to print around 300c, in an enclosure. I created my own print profiles with dozens of hours of testing, to assure as close to a solid structure as possible. When I cut a print in half, It looks like an injection mold on the inside, with absolutely no voids.