Hello everyone, here is my latest creation: a small spring-powered, 4-wheel drive car, in a minimalist, easy-to-assemble version. It can be used for educational purposes (mechanics, math, etc.) or simply as a toy. It will allow you to understand the operating principles of a spring-powered car without risk of error (because everything is detachable). It is also a first step towards my more sophisticated models (feel free to check them out: https://makerworld.com/fr/models/733706-hot-rod-v8-spring-engine#profileId-665458 )

No glue, no purchased parts, no tools (even the 10mm wrench is 3D Printed). Assembly is simple and can be done by children from 8/9 years old. Once assembled, it can be handled by children from 4 years old. (See video)

These cars are tested and approved by my own children!!!

This small car is designed to be easily assembled and disassembled so that you can change the transmission (3 transmissions available: short – standard – long), to switch the transmission only to the front wheels or only to the rear wheels or to all 4 wheels. This type of assembly also allows you to change any broken part

For better grip and for assembly, it is necessary to print the tires in TPU but TPU for AMS, PLA and TPU 64D will not work because you will not be able to insert them onto the rims. I use TPU 60A but you can go up to 85A. If you don't have the option to print TPU, you can make the tires with small elastic bands, O-rings, or bicycle inner tubes (the rim's groove base has a Ø of 27.5mm). You will find new rims for mounting CyberBrick tires in a separate print profile (use the nomenclature to find them more easily)

I have created detailed assembly instructions to guide you during assembly. At the end of these instructions, you will find all the necessary data for creating math exercises related to this spring-powered car

HAVE FUN!!!

Update on 09/16/2025: increased functional clearances on all axes (from 0.3mm to 0.45mm clearance)

NEW!!! 06/17/2026: Added print profile for rims to install CyberBrick rubber tires

New model with a body : https://makerworld.com/fr/models/2238342-wind-up-car-hot-rod-wind-up-mechanism#profileId-2436133

(During assembly, keep an eye on young children: there are many small parts that pose a choking hazard)