Got the Titan extruder and the Vulcano nozzle done, and happy to be able to use all my 2.85 rolls.
I must say the online tutorials are not really clear, I got trouble as the grub screw that clamps the toothed sprocket on the stepper axle was sticking out too much, and I had to file it down half way to get it to work, and had to add about 2mm between the titan and the stepper to get the toothed sprockets to sit flush with each other.
It could be, using the FT5 standard stepper is maybe not often done, and the E3D stepper is different.
After some test prints I found that too much fan air causes thermal runaway, this is something I will have to account for when designing the fan holders, and is a nice safety feature.
I am now testing a large print with some ABS (I hate that stuff) I still had a full roll that I never used, it sputters a bit after months of moisture collecting
After fiddling with the print head, the melanine parts are showing signs deformation, the printhead is sitting very slightly angled, I can see it with flat surfaces, it leaves small marks.
and the 713 parts will probably be the next on my wish list, or make it myself.
