Some custom Y-axis mod I did to reinforce the bed at the most forward/back of the heat bed, please note this does not make the build surface bigger, this is only to add a second set of sliding carriages to the Y-axis. This was done to remove the “bounce” I noticed when the Y axis changed direction, on top of that it will make the furthest edges of the build plate stronger and reduce the stress on the center mounted carriage when using the CNC router to full dimensions.
The carriages are about 230mm apart (can’t remember the exact dimension currently), and are missing the lead screw nuts (as the lead screw was never changed to be longer, also reduces stress on the stepper motor and was redundant to power both carriages). The extensions are 256mm long and use a new 5mm guide rail made of hardened drill rod material. I had also made a new bed to go under the heated buildplate out of 6mm aluminum with a Plexiglas isolator to keep the heat bed from shorting out on the aluminum.
Please note all these mods have voided my warranty, which I have no issues with, but I really like the more stable build platform.