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This is fully compatible with the Taz 6 carriage. The carriage shown in the picture is actually my modified reinforced carriage, which is basically the same profile as the Taz 6 carriage with extra reinforcing. Printing extruder cold ends in ABS or higher temperature materials is recommended, the one shown in that picture is ABS. The 3.00mm variant of that extruder body that was printed at the same time is still in use daily for long prints, and has zero deformation from heat 8 months later. I have older similar style ABS extruder bodies that show no ill effects from printing. A polycarbonate one isn't a bad idea if you can print the material well, but ABS will work great too.