More armature hour tips: Did you open all your titan extruder boxes and dump the parts in a pile? Does your extruder skip/click/tear through filament? You may have done what I did - the idlers are specific to mirrored or not. White dot = mirrored. No dot = regular. The difference is the idler pin is flush on a different side. Took me a bit to figure that out.
Good spot. But no. I did not go for the 'jumble sale' setup In fact my build process was to get a one extruder system fully working, then introduce a second tool to figure out multi-material. Once I sort that all out, tools 3 and 4 should be simple. Actually, I'll roll that back a bit. I did fit all the Titans, so I could have easily done what you did, but didn't
Ouch. I'll be sure to build one at a time. I'm glad I thought to read every post here. Thanks for sharing.