This model already includes needed supports since the slicer was not really good in creating reasonable support structures here. I printed this with Prusament PC Blend with 0.2mm layer height and 20% infill, though infill settings don't really matter given that there is only one small place in the model where there is actually space for infill anyway.

Do NOT make an attempt to print this with PET or even PLA since while this for sure is printing nicely with those materials they cannot withstand the temperature the popcorn machine is creating. I learned that with my first attempt I did with PETG without thinking about the heat problem before.