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Just a note about my vision of the correct flow shape. I would like to illustrate how i like it. See photo below.

I maxed the cooling supply so its more clear whats happening. When milling...

Air supply pressurizes at 2 bar the container which is just about right for the air flow needed, so no need for super precise separate regulator at the end, one normal regulator with filter before...

Those bits are fine. But as you know the cap is a bit (lot) expensive. ..Clive

http://www.cs-lab.eu/en/produkt-18,2-CSMIOIPM_4axis_Ethernet_Motion_Controller_stepdir_with_connectors.html

It's on the page :wink:

In a nutshell you'd get smoother movement from the motors, esp at lower speeds. Also less motor heating as they handle current much better and the drives software seems much more refined.
These...

I use M8 for bolting together the Gantry your copying. M5 for fastening profiled Linear rails.
In general you'll need an assortment of M5,M6, M8.

Depending on how your fastening Steppers then...

Sounds like the very same question I spent best part of a day trying to work out, then Jonathon helped me :D

this is what you are looking for (I think)
7902

So, for me I wanted both ends...