Just finished building this beast. It's a ratrig Vcore 3.1 with a 500x500x500mm build volume and blazing speed.
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On my VC3 500 I use a rapido with a 0.4mm. My default PLA settings are 300mms with 10kmms2 acceleration. I'm not sure about OP but for me the larger build volume lets me kick off a full plate of parts and come back a few hours later. Gets pretty good quality but at that size/weight you do get some ringing on the parts.
Ayy another vc3500 haver. I use a .6mm bondtech CHT volcano, but honestly I've been having trouble getting past 30mm^3 per second, which is unfortunate. My main goal with it is actually giant parts, but the mass production thing is pretty cool too.