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That looks like it prints really well from this point-of-view. I ended up remixing all of the corners (motor mounts, idler pulleys and feet) to try and improve the clamping strength between them and the rods. I added some length, too, which seems to have improved rigidity of the cube quite a bit.

I changed the design of the y-axis bearing mounts to improve clamping force on the x-axis rods, too, with similar hopes regarding rigidity. These changes, unfortunately, have come at the cost of vastly increasing print times.

I am still putting things together (it's about 5 hours to print each piece) so I can't say if it'll help I'm waiting on another pack of thread inserts so that's slowed down progress. I'll start posting up remix files tonight so you can take a look and see what you think. It's still very much a work-in-progress so the design may get scrapped.

I'm having quite a lot of fun making this, I'll admit.