I print them separate, top part with PLA and bottom with PETG, your personal choice.
The author remixed this model.
Original design by @Makkuro! thank you for the great idea and design. Uploaded a popular demand for the slang word "Skibidi" on your Crocks with customized font (my idea for the font came from the skate magazine Thrasher which i tried to replicate). For better appearance change filament color at 5.8mm (personal choice)