Aluminium Extrusion T Slot VS V Slot

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V-Slot is a high quality extruded aluminum profile building block that has an extremely smooth linear v groove rail on all 4 sides

Does any one know of a shop in perth that stocks T or V slot aluminium extrusion? Something simular to this: V slot extrusion  section area, but maybe someone has done some research or has experience comparing the precision of T-Slot extrusions to V-Slot or rods

circuitos slot digital V-Slot is an open source and high quality aluminum linear rail profile with an extremely smooth v groove on all 4 sides It's precise, easy to work with and China Manufacturer Customized Aluminum Extrusion Profile T Slot V Slot Aluminium Profile, Find Details and Price about T-Slot Profile Building Material from