My rear rack didn't have enough bars to keep my saddle bags away from the spokes on my rear wheel. I designed this to hang from the rear rack and just zip tied it to the rack at the bottom.

The cross bars can be any 5/16"(8mm) round: metal, wood, even plastic. I used bolt stock which can usually be bought in 3' sections so I cut two into 3 pieces each and added nuts to hold it but if you used plastic or wood, glue would be fine. You could even 3D print cross bars.

The hooks at the top are slightly larger at 8.5mm, check to make sure they will fit before printing.

Creality

Ender 3

Doesn't Matter

Yes

0.3mm

20%