28BYJ-48 stepper motor.
It is 2$ on ebay with wires and driver.
Tolerances on the 36mm tape spool to fit the stepper shaft are not tested. Some force might be needed.
Rest is 3d printed
Electrical Engineering student , fpv enthusiast and all round tinkerer. All my designs are printed with my Ultimaker 2.The design program i use is Soldiworks and after that NetFabb (freeware) to fix / opt...