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That's quite possible, I know the m200 has had at least one or two revisions. It may be that instead of trying to design a solid, perfect fit version I need to build in mechanisms for tweaking it to a perfect fit on your specific machines (slots and spacers for example). User mdkendall had perfect front to back alignment but was off 1.5mm in the x axis so he remixed the bearing holder slightly thicker to compensate:L http://www.thingiverse.com/thing:1859754

MP Select Mini X Gantry Support Bearing Holder Adjusted