I tried downloading some models but they wouldn't fit well (usually too wide). This one has a bit longer body than the plastic ones typically found around - for easier manipulation but at the same time not too long to prevent interfering with the spokes.
Print with 60% infill to make sure it's firm & solid. I also used 0.10mm.
I'm not including any gcode as I print on MMU2S; some folks might not have it and those who do I assume they typically choose their filament last minute as me. ;)
The author hasn't provided the model origin yet.