Hi, I'm from England. That sucks because it means that I don't have much availability for parts where need be. Fortunately a lot of the Open Builds stuff is available at a couple of DIY CNC online shops here, and I have access to 3D printers. I need to build a CNC Router with 1500x1500mm frame. Feel free to stop me at any point if what I say is dumb, I've only been researching CNC machines for a couple weeks. I have about $2,500 to work with, and would like to keep costs down. My decision for a good basis was the Ox-Metal CNC Router Mill by Schematix. As I need to do work on aluminium, leadscrew seemed like a good, cheap choice. I also need pretty decent accuracy/repeatability given the amount of framework I'm dealing with. Unfortunately, the Acme lead screw in TR8 variant is only really useful for builds of up to a meter. For that reason, I decided that I'd need to make my own variant of the Ox-Metal based on TR12 Leadscrew. This is where I need help. From what I can find so far, if I were to make an Ox-Metal with TR12, Other than changing the overall size of the X and Y axis, I need to change a number of components to accommodate the new lead screws. I would need to modify: - The size of the flexible coupling for the motor - The bearing guide used on either end of the carriage for the lead screw - The size of the lock collars to secure the lead screw to the carriage - A 12mm anti-backlash nut block, rather than the standard 8mm - And add a few mm clearance for the Z axis past that already introduced by the spacer block for the lead screw Are there any other considerations that I need to make before running off and buying a bunch of stuff? Are the changes that I've suggested reasonable to assume are possible for a hobbyist who has limited access to tooling, apart from a local hackerspace with some 3D Printers, and drill presses? Does the size of the lead screw introduce any new mechanical considerations, such as friction that might need to be considered in terms of the motor torque? Are there any parts that suit my modifications that are already available? And better yet: Are there any *better* ideas than mine, that would give me a heck of a lot easier a time in getting a 1500x1500mm frame CNC router/mill up and running?