A little balance plug protector, to attach the balance plug to the lipo cables
non commercial license, but you are free to print this for a friend for only the filament costs
;-)

Print instructions

Category: R/C Vehicles Print Settings

Printer Brand: Prusa

Printer: i3 MK3

Rafts: No

Supports: No

Resolution: 0.2

Notes:

has to be printed in TPU or other flexible material to work
3 perimeters makes it solid...