This is a two part PLA/TPU wheel to provide strength, flexiblity and grip. The spacer should be placed on the axle first, followed by the hub and the nut. The tyre simply slots on. When slicing, simply clone the wheels and mirror two of them for a full set ( these functions are in the right - click menu ) . I have included the fusion 360 files so you can all adapt it if you would like. I will be releasing variations of the tire so check my profile; the tyres are easily interchangeable, removing any hassle. If you only have PLA or another hard material, check out my one - piece wheel. The TPU tyres do make for a pretty balanced tyre; not as grippy as the stock tyres but still grippy enough and easily driftable. If you want more slippery/drifty tyres view the 1 piece hard wheel. No glue is required.