3d printer toolhead for cnc / 3d printer combo

this is a part of "cnc / 3d printer combo" design. the idea is to make a fast strong cartesian machine that can accept various toolhead, like 3d printing, cnc, plotter ,laser and ...
video on this channel youtube: "Learn,Make,Forget"

parts:
a 2mm laser cut iron plate
SK16 shaft support
E3d V6
2x 40mm fan
4x 20mm 3d printed spacer
4x 40mm M3 screws

machine assembly:
https://youtu.be/_etC2u4u9DE

this assembly:
https://youtu.be/4SK8OHhjzJ8