That thing is a simply and useless valve cape, made out of TPU.
I use it because i don't like to close the valve hole with scotch tape.
It should be printed with skirt and 100% infill.
My wheels are Excel Takasago ( but i ìt can be adapt to other)
L.P.
Printer:
geetech a10
Rafts:
No
Supports:
No
Resolution:
200
Infill:
100%
Filament: geetech TPU red