[HorridHenry]

Do bother with 16mm Round rails

I think he means "Don't Bother".

25mm or over is ok,the bigger the better and what you can afford?

[crane550]

Yes, I would also go with the 20mm rails. They are not much more expensive then the 16's, so that is a no brainier in MHO.

Over all, I think the 20mm rails are a more professional solution then the CRP option, but the CRP makes building really easy.

If you really wantto get nice, check out the HSR or SHS 20's from THK. You can find them used for decent prices, and can't go wrong there.

[newpatch]

I was going with the 20mm for my project...the 16mm link was just for a visual.

I would also go for the square rails but I'm thinking they are out of my budget. I've seen linear motion round rails on ebay for a good price, a set of 3, one for each axis. Some of the members here have purchased them and are happy...

Things might change, but so far they are in my design which is a 2ft x 3ft cutting area machine....

newpatch