Hey guys. Looking into building a high accuracy tantillus style printer. Planning on having a 400mm X 400mm silicone heat bed with a build height of at least 700mm. I have some extruded aluminum laying around that I want to use for the frame. Any suggestions on what is the best rail/motor combination for the bed ±Z axis? I am thinking something like linear guide rails with a ball screws on geared stepper motors, but don’t want to shell out insane amounts of cash.