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Threded rob printers were not replaced by lazer cut plywood. To this day the Prusa i3 decendants are still made of threaded rods.

Not on anything decent after 2017. Prusa i3 MK3 has no threaded rod. Creality, Sovol, Sunlu, Tevo, etc all used extrusion frames for their i3s. MendelMax, Lulzbot, etc went extrusion very early on. Threaded rod Mendel's have way too much side to side movement.

Nothing necessarily replaced anything at any given point in time. But the first few RepRap printers were threaded rod frames. Very quickly the majority of sold kits were plywood. From 2012 onward it was a pretty healthy mix. But current i3 descendents using threaded rod? Would love some examples.

I really need to fire up my old Flashforge Creator Pro but I think I'd need to update its hardware to Klipper first since I don't think its slicer works on modern Macs