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On my build, the top_support file is just a hair too wide at the top, even with the bolts reversed and the bolt heads down. I cut a notch with my table saw about 3 mm down on both sides that eliminated the interference. My machine is the MPCNC 525-C (For 23.5 mm conduit) with a 2' by 6' usable area.

I am surprised at the effect a single support has on a nearly 7 foot span, but I still intend to use two per span.