Hey Thomas,
the total lack of any cable shielding is unusual in the industry (for this reason), the same with not enclosing a VFD in a grounded VFD Control Cabinet. Also a seller of a machine that has to be assembled and made functional by the operator and is a class I device should provide instructions for Proper Grounding; How have you grounded your frame? and for What is needed to ground your Onefinity CNC machine.
I would never put a Onefinity CNC into service in its delivery state. Even if it’s assembled according to the manual. I would at least retrofit the lacking strain relief on the connectors that are subject to permanent movement, and ground and bond all moving parts of the machine. Many lost steps and thus, lost workpieces, as well as static electricity induced by the dust collection, reportedly disappeared after grounding the machine properly.