First time posting but have been reading and exploring this site for nearly a year. About 7 months ago I build a frankencnc literally out of materials from old 3D printers with a build plate of ~275x275. It'll do most of what I need including aluminum OK. Almost immediately I started working on a V2.0 fixing rigidity issues and larger build area. My design is loosely based on the Ox and I've changed my Y rails over to 4080 C channel (was using 4080 extrusions as my local salvage yard gets 100's of feet of this stuff a week) but I'm running into a potential snag. I have some ~600mm HGR20 rails with 2 blocks per rail and could use 2 on each side on the Y axis but they are so chonky it leaves little room for my leadscrew and nut block in there. The alternative is I can switch to MGN12s but I'd need to source those with extra blocks. I see that many but not all designs seem to use a dual rail setup on the Y axis and I get why but given the extra heft of the 20's could running a single per side be a feasible option? I've even considered maybe a single 20 on the bottom and V wheel guides at the top as a potential option. I don't intend to cut any steel but do find myself using my current one for aluminum more than wood. I'm no engineer so I've got no way to quantify or qualify 1 vs the other and thought I might turn my question to a forum full of folks more expert than I am. Thanks in advance and I appreciate the feedback. Steve
