As a kid, my mom was telling me that vegetables would make me stronger. It was true! Here's how to make a dumbbell with tin cans using a snap fit ABS handle.These models were made a while back for project RE_, but now they are FREEEEE! Come and vote for me on Instructables Make it real challenge! :http://www.instructables.com/id/Project-RE-by-Samuel-Bernier/First step it to print the handles! I used white ABS.The STL Files are below. Dumbbell moyen (part 1 and 2) is for 83.75 mm diameter cans. Dumbbell small is for 73.25 mm diameter cans*Note that not all printers print equally and that different materials wont shrink the same way. If you use a different printer or a different type of plastic, you might have to adjust some settings to get a perfect fit. All the detailed informations on this link : http://www.instructables.com/id/Tin-can-Dumbbell-3D-printed-by-Samuel-Bernier-P/If you are having difficulty getting a good resolution with your UP!, I suggest you also build this box as showen in this instructables : http://www.instructables.com/id/How-to-get-better-results-from-your-UP-3D-printer/