Robomow Cutting Disc, reduced

My attempt on reducing the material, weight and printing time on a Robomow cutting disc.

Unfortunately I too late realised that the original is a bit higher than the Robomow knife, and so is not so well protected in the mower.
I suppose that's the reason it broke when it hit the edge of my wooden terrasse :(

So just posting in case someone wanted to remix it to original hight