3 Plates are included in the STL:
Adjust the rack width by sliding either side of the rack left or right.
I printed with snug supports, 30% cubic infill (attaching my gcode file) on an Anycubic Kobra 2 Max with Elegoo Rapid PETG.
The rack I am using: Ibera Bike Rack
The author remixed this model.
I used the original design as a template to create my own rack in Tinkercad.