I agree specially for the screw of assemblyIt's looking good (I would hate to have to build something this complex without the aid of a 3d modeller)
[/QUOTE]I'm curious (I'm sure you have good reason), why use two upper rollers on the bottom and why the large lower roller on top? (At first glance, there appears to be enough room for a single roller in each place. Thus reducing the number of different parts )
for the Xaxis on top 2 small 27mm rollers and one 40mm roller down because :
the original support is much more slim .to install our support we must lift our support from under the table and then fix the 2 side support with allen screw since we cannot move our support the screw are with angle since this piece in steel rich in carbon must not twist every thing must be thick .
But not enough space dont forget that under we have the y axis the 2 screws are 32 mm and they are on top each other 100 mm at 90deg
for the y axis i use 4 rollers 27mm
definitely interisting to design and I make big progress with solidwork