Wouldn't it be better to print it so that the layers when installed are horizontal? Isn't it going to split when rocking now?
The bits in the tennis ball cups are sacrificial supports to aid printing process. The inside is a honeycomb lattice of varying directions. I set the density to the lowest I think at 10% to save filament for this test piece. The slicer program works it all out automatically. But if you've got the engineering background to assess the forces , you can manually design the direction of print.
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