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For my PT Cruiser, I have a set of summer tires (all-seasons, not actual summer tires) and winter tires. They each have their own rims for easier swapping.

The difference is that my summer tires are on the PT Cruiser rims and the winter tires are on Volkswagen New Beetle rims, so the PT hubcaps don’t fit on the winter wheels.

The problem with that is that with no hubcaps, the axle nut is exposed to water and dirt and salt. Here in Michigan they get rusty and corroded enough even with hubcaps, leaving them exposed is just asking for trouble next time you need to pull the knuckle or axle. So I wanted to cover them up.

So I measured the axle nut and I already knew my bolt pattern (5×100, same as VW New Beetles and Toyota Prii), so I got to work in Tinkercad.

I came up with these thingies. The center bump needed to be large enough to accommodate the axle nut protrusion. And the mini hubcap needed to be large enough to fill in the concavity containing the lug nuts, to effectively keep splashes of whatever from trickling into the axle nut. No, it’s not perfect, as stuff on the outer rim can trickle into the middle. But it’s a spinning wheel so in theory anything viscous enough to drip into the middle would have already been flung off the wheel during driving. Ideally.

I also wanted to lower the print time, so I was going to reduce the material used. I started to make extra holes in the outer skirt, but then that would have allowed stuff to splash in. So I made the material thinner in spots but not holes all the way through.

It did take me about 3 iterations to get the size of the lug holes right (hard to measure well with that taper so it sits snug against the nuts but doesn’t get pinched enough to crack) and to account for the cotter pin variance on the side I didn’t measure.

I printed it in PETG instead of the PLA we normally use. The main reason behind the PETG is better UV resistance. These hubcaps are going to be sitting outside the whole time, lots of sunlight exposure, so UV stability is good.

The end result was this:

And for those of you who are interested enough to print your own, here is link to the STL file for the mini hubcap.

Enjoy!