A TECPRO style racing circuit barrier, perhaps for your OpenRC F1 racing needs.

It is designed to be printed just as a thin shell. You can then use a paperclip on the recessed underside to connect a few of them together. Because it is just a shell, it doesn't take much filament and is relatively cheap to make.

Print instructions

It is designed to be printed just as a thin shell with not top layers and no infill, but laying upside down from the use orientation.