Update 28 FEB 2021 -> The Fully 3D-printable wind-up car gift card has been removed from Thingiverse and can now be found here: https://bbprojects.technology/collections/stl-fusion-360-source-files/products/fully-3d-printable-wind-up-car-gift-card-files

Video can be found here: https://youtu.be/0SO7Gl-gxPo

STL and Editable Fusion 360 source files can be found here:https://bbprojects.technology/collections/stl-fusion-360-source-files/products/3d-printable-davinci-catapult-gift-card-files

Because a lot of people liked my previous gift card (Fully 3D-printable wind-up car gift card: https://www.thingiverse.com/thing:3308710) and asked if I could create another version of it, I decided to make this Leonardo Davinci inspired catapult gift card. The whole card can be 3D-printed in one go, you don't need any extra parts except for some wire. The card can be printed without support and the print time is about 3 hours with a 0.2mm layer height. The card can be printed using regular PLA. The whole thing is designed to be able to snap fit together so there's no glue necessary. I did a lot of test prints of different parts of the model until I got some consistent and good results. It is of course possible that depending on which printer you use the result may vary. You can always let me know in the comments which parts work for you and which don't so I can create a second version of the model. I added all the parts seperately to for the people who just want to print the catapult and do not have the intend to give the card as a present.

I also created some instructions to add to the experience of building a model kit. The pdf file can be found in the file section.

Video can be found here: https://youtu.be/0SO7Gl-gxPo

More info can be found here: https://hackaday.io/project/169130-3d-printable-davinci-catapult-gift-card

Recommended Tools:

PLA filament: https://www.banggood.com/Creality-3D-White-or-Black-or-Yellow-or-Blue-or-Red-1KG-1_75mm-PLA-Filament-For-3D-Printer-p-1290153.html?p=E01411629100201406T1&custlinkid=926158

Recommended 3D-printer: https://www.banggood.com/Creality-3D-Ender-3-Pro-V-slot-Prusa-I3-DIY-3D-Printer-Kit-p-1346320.html?p=E01411629100201406T1&custlinkid=677427

Paypal: https://paypal.me/BrockenBrian

Feel free to take a look at my other designs:

3D printable antweight battlebot: Bulldog: https://www.thingiverse.com/thing:4623536
SpaceX inspired edf rocket: https://www.thingiverse.com/thing:4606751
3D printed high torque servo/gearbox version 2: https://www.thingiverse.com/thing:4547703
UMC - Universal motion controller: https://www.thingiverse.com/thing:4245315
3D-printable Davinci catapult gift card: https://www.thingiverse.com/thing:4067668
Arduino controlled photogrammetry 3D-scanner: https://www.thingiverse.com/thing:3958326
Fully 3D-printable turntable: https://www.thingiverse.com/thing:3723618
RC FPV tank rover: https://www.thingiverse.com/thing:3587738
Fully 3D-printable wind-up car gift card: https://www.thingiverse.com/thing:3308710
3D-printable High torque servo/gear reduction: https://www.thingiverse.com/thing:3292860
'BOOM box' high voltage capacitor bank case: https://www.thingiverse.com/thing:2980012
Subby the interactive youtube subscriber robot: https://www.thingiverse.com/thing:2928254
robot hand || bionic hand prosthesis prototype: https://www.thingiverse.com/thing:2838239
3D-printable linear actuator: https://www.thingiverse.com/thing:2783959
Mini 3D-printable crossbow: https://www.thingiverse.com/thing:2710472
8 legged spider robot: https://www.thingiverse.com/thing:2470882
best 3D-printable bearing: https://www.thingiverse.com/thing:2349065

Have a nice day!