I went camping and used my 40qt Coleman cooler for the first time. The pin that retains the handle magically disappeared on the way to the campsite. The pin has a rib on the cylinder to help lock the pin into place. I had to use a little force to get the pin pushed into the handle assembly. I printed with 30% infill and with raft. I've included my 123D design for others to modify. Printed with PLA 30% infill With Raft