the block has been upgraded again. the channel had to be changed to 2mm each because we couldn't find bits of 1.5mm and this followed that i had to decrease the amount of channels. now the channels are 10 not 12

and other thing that i had to change is the outer shape because with the mill that my friend uses he cannot make ovals, only circles, so i changed the other channel to 2 pieces of 120degrees each of a circle. here is the new design, maybe something else will be changed, i will keep you updated.
This block should be ready by next week

hope that it performs well