This is a handle I designed for my sons to be able to hold their Hot Wheels track while sending cars down. It slides into the groove on the bottom of the track and provides something to hang onto or to hang on various objects to create interesting slopes and send cars flying across the house! Thoroughly kid-tested and approved.

No special instructions on printing, finished part may require some sanding to ensure a good fit in the track - it should slide smoothly without hanging up tor prevent extra wear on the track.

Attribution - Creative Commons

HotWheels