Thanks!
The rails/bearings are the cheapest Chinese copies I could find. Company called noulei.. I ordered from aliexpress but have found them on ebay also. Didn't want to pay for expensive thk or even hiwin incase I don't use the machine much..
If I start making money with it I'm fairly cetrain that you will see a new build log ;)
Maybe I should find where I ordered from.. might have to order a new carriage as I have dropped a ball in one (saw the drop and tried to put it back but it could have gone in the wrong track ) and it's very juddery/stiff :(