This wind-up car gift card is the ideal present for your loved ones. Everything on this wind-up toy car is 3D-printable, the spring, shafts, gears, wheels, everything! There are no other parts/tools necessary except for your 3D-printer and some filament (although a small hamer and a knife would be usefull but not necessary).You can make you loved ones happy by giving them a nice present and on the same time you can show them what is possible with 3D-printing.The print time for gift card 1 (the one with the most parts) is about 4 hours. The print time for gift card 2 (the one with the wheels) is about 2 hours. I decided to print them with 100 percent infill because there wasn't that much of a difference with 25 percent infill, the print time was about the same. Another reason for 100 percent infill is that the spring is being printed better.
Stl-files can be found here: https://www.thingiverse.com/thing:3308710
Video can be found here: