I'm wondering if I could have the X arm and slider be 1 part, and I got the idea to access the M8 nut cutouts from the side. This should also make it easier to dust as there's no deep top holes.

Next was the rail, and wow a HGR20 rail that's 150mm looks short.

It doesn't look like HGR20 is going to work all that well, so I swapped to HGR15.

Thought it was a good time to import the new slider into the main file and finally apply slider joints instead of rigids to the Slimes.

Now I can finally drag the heads around.

What distance is that? Fusion: 200mm. Wait, if I play my cards right, I can get a solution I didn't think was possible because of the bowdens. 

No way. If I have the right Select connected to the left Slime (instead of left to left and right to right as I originally planned), a solution could exist.

I'm not seeing any problems when taking Z into account either. This alteration would increase the independency of the IDEXY solution. For example, I could do mirror mode on the dual 65x20cm glass beds or access one more tool from the tool bar.