I found the various motor mounts projects available either bulky or too fragile.
I've made this one that is meant to be fixed to the cf tube using a single 2mm screw without sacrificing the sturdiness.
Motor hole pattern is the standard 12mm/16mm found in almost any 18xx class of motor. I'm using this with DYS 1806. It is made for 12mm outer diameter tubes.
Update 30 Sept:
added Inventor part files and an experimental/untested 22xx version with 16x19 hole pattern.
The 22xx version is totally untested, please provide some feedback.
I printed successfully it in ABS using either 0.2 or 0.4 mm layer height. You'll spare only negligible weight by printing with less than 100% infill, so it is not advisable.
Print a test sample and check whether it is a tight fit with the desired tube. Reduce its size a bit (by scaling the object a few % ) in case it fit loosely.
The drill jig is derived from Firefly ones. You should print two of those (or just one, reusing one from Firefly if you have already printed them).
Drill the 3mm hole to fix to the frame, then rotate by 90° and drill the 2mm hole used to secure the motor mount at the other tube extremity.
You will need the following items to assemble the mount:
- 1*M2x20 screw to lock the mount on the carbon tube)
- 4*M2x5 to secure the motor