Brunt Blind Engine - Large Blind cog

I was very excited to receive my Brunt Blind Engine but when I fitted it to my son’s large window blind (approx 2m wide) the provided cog soon started to fail. Customer support was unable to offer any help so I thought I would see if my M3D micro could makes something better.

It took 4 builds to find a cog that would grip the chain and open and close the blind, and another 2 to create a cog that fitted under the cover.

Here is my solution that is working better than the original so far.