RepRap Yo-Yo
thingiverse
In just 60 hours, print a Mendel or a quicker 20-hour Micro Mendel, but then you may feel impatient. With 624 bearings, M4 socket caps and bolts on hand, consider building a Yo-Yo for fun! HeeksCAD has the design file ready with Boolean operations easily customizable. Despite being a Yo-Yo novice, I managed to create a functional one; however, you can improve its performance with better design skills.
Download Model from thingiverse
With this file you will be able to print RepRap Yo-Yo with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on RepRap Yo-Yo.