The Comandante C40 is known to struggle with getting the right grind setting for espresso, so I first went out and got myself the Red Clix set - which definitely improved my experience making coffee but I still felt like I was sometimes missing the ability to fine tune my grind setting.
I went ahead and basically doubled the amount of holes through a chip which you put between the burrs and the grind setting wheel, It locks into the holes of the burrs and mimics the same usage of the normal grind setting procedure.
With this chip you will be able to cut your grind steps in half from 30microm to 15microm for the standard Comandante and with the Red Clix mod you go from 15microm to 7.5microm.

If you use my design feel free to comment on it and give it a review, I am keen to hear about your user experience and possible improvements on this piece. Also if you want to support me and my future Comandante/ Espresso upgrades feel free to share my site or leave a donation.
(ALSO white is probably the worst colour to print this in, since it will look quite bad after some usage, USE dark colours)

Have fun with this little upgrade.