Mammotion Yuka 5 Blade Disk and Cover

A few features I put into this:  3mm pilot holes in the disk head can be tapped with a 3mm tap, (or just warm up some M3 screws and screw em in).  These are for M3x5 or M3x6 Socket Head Cap Screws, which fit into the guide holes on the yuka.  I put in an extended grass deflector above the disk, to stop grass from building up underneath the disk.  Reuse M4 screws to mount disk to Yuka.  I printed in ABS and acetone welded the two parts together, but you could use glue instead.  Automower blades are 0.75mm thick, Yuka standard blades are 1.25mm thick, so use the correct disk cover depending on your choice.  M4 x 8 x 5.3 heat set inserts (I used Ruthex M4x8.1 inserts).  Insert them so they are flush with the main disk bottom.  They may stick 0.1-.2 mm proud on the backside. 

There is a sacrificial first layer on the bottom side of the disk where the screws to mount to the mower go.  It's so that the holes aren't started directly on supports (I used supports to get a better surface finish on that flat inner part).  You can easily punch through that once printed.  My printer is very well dialed in even for small holes, so you may have to adjust shrinkage/xy expansion to get a good fit with screws and inserts.  

Fusion 360 file attached as well in case you want to remix.  

I printed at 0.2mm layer height, 4 perimeters, 5 top and bottom layers, grid support for the center flat section on the main disk, and 50% grid infill.  I modified the center disk section to be 100% infill.