Quote Originally Posted by PaisleyPCdoctor View Post
15mm x500mm square rails with 2x carriages was £37 off eBay. They were posted from uk but still surprisingly quick for Christmas time.

I ordered a second today, it'll arrive before I have time to build anything anyway.

I'm quite worried about getting the mounting holes correct. I think I'll mock it up in acrylic or something first. Once it's correct, I might pay someone to machine it in aluminium. Might be able to do it myself- we'll see. Lol.

I plan to buy two 20mm rails , 750mm long to replace the y axis bearings. Looks like a pretty easy job. That's gonna cost me £124 (china). After that, there's not much left and I'll just have to get on with actually milling stuff.
I used 9045 Tslot extrusion with made it super easy to mount the rails but AFAIK they don't do M3 T nuts so would not be useful to you.

Although maybe not so useful to you KJN can can drill holes in extrusion at a reasonable price.