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Misumi-USA company sells custom-made frame kits and I can get one for $192 for a 600mm X 600mm X 600mm frame
https://us.misumi-ec.com/vona2/detail/110302285350/?Inch=0

I'm afraid to buy the kit from https://www.strong3dprinters.com/ because maker may be in China. There is a store that sell parts at https://www.smw3d.com/ They sell motion kits but which is better:...

Another company makes 3D printer frame kits but they're very expensive - https://3ddistributed.com/collections/3d-printers
They didn't list the build volume but they use lead screw driven motion...

I'm thinking of buying the Strong 3D printer frame kit and use parts from my PowerSpec Ultra 3D printer that broke down. I will need to buy a new controller board such as Smoothieware board and build...