After building BluCrawler, I wanted to see what other possibilities there were with builds using RC crawler tires.  LEGO is not there yet with similar tires (closest are the Claas Xerion tires – but they are not crawler tires).  Anyway, it’s challenging to mate a LEGO hub to an RC tire.  There are aftermarket adapters out there, but they are expensive, so I decided to design and print my own.

The STL file is available on my Etsy shop.  Samples below printed on a LulzBot Mini, 60% infill, no supports.  Depending on your printer tolerances and output quality, you may need to drill out the pin holes.
 

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