In regards to carriages, I understand that Hiwin is the brand of choice but I just wondered when you would chose to use the W kind, with the side flanges as opposed to the regular square type? So when for example you'd chose to have HGW15CA or HGWCA20 instead of the what seems to be the more common choice of HGR15CA or HGR20CA.

Also, is it common to have the 20s on the X & Y Axis' and have the smaller 15s on the Z? This seems to be quite a common choice

I've been watching this video series on YT and that was what got me thinking about the 'W' carriages, as he uses the 'W' variety on his Z axis and his Y, but the 'R' variety on his longest X axis...

https://www.youtube.com/playlist?lis...yCkJLcRBChdojC

Finally, are people happy to go with the self-made ball screws that Fred @ BST supplies, or do people still stick to Hiwin branded wherever possible?

Cheers