Summary

Convert your gMax 1.5 X axis to accept the X-axis plate used on the gMax 1.5+.

Blender:
Download Blender from Blender.org. to open the .blend file and see the gMax 1.5 X-axis conversion file.
Navigation in Blender:
Hold middle mouse button to rotate, scroll middle mouse button to zoom, 'Shift' + middle mouse button to pan.
You can select any part in the list to the right or select it with your right mouse button in the 3D view.

All of the parts you need to print are in the printTheseParts folder.

PARTS YOU NEED TO BUY.

OpenBuilds:
1 x 20mm plate

4 x V-slot wheel kits (you may already have some)

2 x eccentric spacers

2 x 1/8" nylon spacer

2 x 3/8' nylon spacer

25 pack of t-nuts

Hardware:
4 x M5x35 socket head for X-axis plate
4 x M5x25 flathead (countersunk) for Z-axis carriages
7 x M5x10 flathead (countersunk) for X-axis parts
4 x M5 lock nuts for X-axis plate
some 4-40 nuts and bolts (half inch and 3/4)