@Doogs75 I am finishing up a design which should help reduce the problem of the toolhead splaying out as I have had the same issues. It seems that more than half of the resulting movement is from the entire X-axis linear rail rocking from it’s connection to the two Z-axis linear modules. So rather than adding an entire new external linear guide rail to each Z column I am making a brace that will use a roller wheel to secure its position using the outside surface of the Z-axis extrusions (Pictured Below). The other main issue with the SM2.0 is that the whole bed surface has a lot of movement in it from the same exact issue so I upgraded my unit with rails to support the build surface as you can see from others in My new Snapmaker 2.0 A351 
- Snapmaker Showcase - Snapmaker: where creation happens
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