Front Wheel Riser with 3 levels

If you're going to be climbing a lot in Zwift, this riser allows you to raise the front wheel to simulate climbing to a limited degree.

The riser has three levels: 20mm, 40mm and 60mm

I designed the riser with a max tyre width of 28mm.

Print without a skirt or brim if possible as it will occupy all of a build plate of 220mm x 220mm.

NB: Estimated print time at 20% infill is some 36 hours! The print will use around 600gms of PLA filament.