Hello Jonathan, and Thank you for your reply !



X isn't long enough to warrant a 20mm diameter screw, so use RM1610

well, you are right., I was thinking same as you., but when I got my first ball screw RM1605 1m long it was bent about 5 mm in the middle, so I can just imagine what will happen with 1.6m long screw


Gecko G540 is a waste of money - get something like this
These motors are good and probably cheaper than what you specified.
I can not argue with you about the drivers and motors, probably you are right .,
but : 1. I already have one G540
2. maybe I have spent to much my time on American forum before I found you guys in the UK (so there is reason why I have chosen these drivers and motors)

25mm profile rails are completely over the top
I'm not sure about 15mm rails, it seems to me that is too weak

or even better remove the gantry sides and have the Z-axis operating below the level of the X-rails.
no, I don't like this design, I want to keep open table design and keep rails & ball screw from dust as much as I can

And finally, this machine will be built not for hobby use, she has to be strong and durable


Thanks

Gytis