Right, I have been listening to what everyone is saying and after looking at the IGUS slides again I have decided to go with the Drylin N 27mm version, this is mainly for ease of assembly and they should be more than up to the job. At RS prices it will cost around the £80 mark for everything which is 12 carriages and 2m of rail, these are at RS prices so I should be able to get it cheaper after I speak to my IGUS man in the morning. This may seem expensive to some but you have to bear in mind the lack of skill and tools that will be required to get your linear rails sorted which are a very important component.

I know the skate bearing idea will work out cheaper but for a first time builder I am not so sure that it is the way to go, using the igus drylin N will make assembly so much easier and I have got a cunning plan as to how it will fit in with the design and a simple way to mount it...

Also been thinking about the leadscrews and may go for M12 trapezoidal (depending on the cost) with some simple anti-backlash plastic nuts. May cost a little more than standard M12 threaded bar but I think that the benefits will outweigh the cost.

17 size steppers should come in at around £10-£12 each so total build cost is not looking too bad.

MDF will either be 18mm or 25mm, not sure yet until I get something drawn up and see what fits best but hoping that 18mm will be good enough.

Table size looks like it will end up at 500mm x 300mm with 2 rails on the X and Y axis as this way all the linear rail will be used without any waste, the remaining 400mm can be cut in half and used for the Z.

I think at this stage I need to get the design done and get something made to see how it performs, enough talking about it, lets get something put together and see what happens. Yes there will be issues but we have to make a machine to find them, some of the issues will have to be acceptable for a low cost machine but I want to get it as good and as simple as possible for a reasonable build cost.

Drawing tonight/tomorrow so will get the designs up on here when I have something to show you all.