3. Modelling software overview

Related links

1. 3D printing parts of car:  https://blogs.3ds.com/3dsmobility/wp-content/uploads/sites/13/2017/04/AdditiveManufacturing.jpg  
2. 3D printing process:
3. Steps of 3D printing:  https://upload.wikimedia.org/wikipedia/commons/2/2c/3d-printing-a-2014horizonwatching-trend-summary-report-9-638.jpg  
4. 3D printer:  https://www.cleanpng.com/png-3d-printing-filament-3d-printers-aleph-objects-inc1348799/preview.html