Has anyone ever used some of the cheaper linear guide rail/ball screw packages they offer on ebay? There is a few kits with varying lengths that are very reasonably priced. It says its a C7 grade so they are definitely a low end rail, but for a DIY home cnc router I was wondering how well they might work. I really like the idea of using a nice linear rail and ball screw setup, but for a small hobbyist/home built router, I just cant justify spending 800-1000$ + on a set of good rails/ball-screws.

If these are deemed no good, is there any vendors on here that sell a reasonably priced set of rails? I am looking to make a router for cutting alum, and light steel in a 24"x36" machine size range.

I'm not sure if linking ebay pages is allowed on this forum, so please remove if this is a violation of forum rules. Here is the kit I was looking at:

SBR20 Linear Rail Set 3 ballscrew RM2005 350 850 1150mm BK BF15 Bearing CNC Set | eBay


Thanks
Ryan