CTC Bizer Makerbot Replicator Dual to Single Titan Aero
Drop in Dual to Single Extruder Mod with Hotend Cooling duct.
Used original motor and just added E3D Titan with Aero Hotend.
Improved version easier to assemble/disassemble
Cooling duct uses M3 Knurl Insert Nut threads from ebay https://www.ebay.com.au/itm/122046120352 I used the M3x4x4 Knurl Insert Nut
You may need to trim one corner of you Aero Cooling Fan as per the images.
The bracket places the hotend nozzle almost exactly over the original Right Hand Nozzle placement to reduce firmware adjustment. Also has striker for the X carriage endstop.
You will need to measure and re drill to move the Z axis endstop up to compensate for the higher nozzle.