Hi! This thing is a lot of fun.

Print it on its flat side.
You only need supports in one spot: around the bearing seat.

You will need eight standard skateboard bearings.
The fit is tight, so press them in with a vise or tap them in gently with a hammer, using a piece of wood between the hammer and the bearing so you do not damage the bearing or the print. Works best on packed snow. Unfortunately it gets stuck in powder, but I’ll be posting updates.

PET-G will work great, printed with 6 perimeters and 50% gyroid infill and 0.3 layer height.
Have fun!

P.S. This isn't my original idea! I saw similar designs online but didn't like them, so I made my own.