Lego-Brick Connector - OpenSCAD

sketchfab

I've heard great things about OpenSCAD, it's a fantastic first-time tool to pick up 3D modeling. The interface is intuitive and easy to navigate, even for complete beginners. You can create complex models with ease, using its powerful scripting language that allows you to customize every aspect of your design. With OpenSCAD, you'll be designing in no time, bringing your creative ideas to life in the most astonishing way possible.