I am trying to source the parts for a Wilson II 3D printer, and the recommended struts are made from 2020 aluminium extrusions, like so:
However, in Bangkok, I can only find this type:
Note that the profile/shape of the slot is markedly different from the image above.
Whilst looking about on the web, I have also found other types, like these:
Again, the profile of the slot varies considerably.
My question is whether standard full size
and half size T nuts
will still fit all of these different types? Or are there different T-nuts for the different types of extruded 2020 aluminium, depending on the profile/shape of the slot.
Also, why are there the different designs, does each type have an advantage for particular applications (with respect to strength, weight, etc.)?
For completeness and accuracy, the 2020 extrusion, that I obtained in Bangkok, actually has this profile:
and here is a more in-focus photo, of four, in a 2 x 2 configuration:
As ericnutsch states, in his answer, only regular hexagonal M5 nuts will fit.