3" Golf tee (76.2mm).
This golf tee will not break after first use! The tee is positioned on it's side during printing, which apart from making it much stronger, also prints faster!
I used a single one of these printed in ABS on a 9-hole course without it breaking, and I'm sure ones printed in PLA will also be quite durable!
Check out my profile for the 2" (50.8mm) version!