ALL 3D PARTS SHOULD BE PRINTED WITH A MINIMUM OF 1.2MM WALL THICKNESS AND 50% FILL.
This is default Harpy VBlock which ships with every kit. Designed with positive notches to hold the rear feathers in place, it is both lightweight and rigid.
Harpy TPU Battery Cushion
Always frustrated with looking for something to protect your batteries from screw heads? In comes the TPU battery cushion. At 2MM thick, it is thin and light.