Preparing a 3D printed model to paint is a very long process. I sanded this 1/10th scale Tesla Roadster 2 using five different grits progressively and repeated the process after applying glazing and spray putty.

Materials (with affiliate links):
- 80, 120, 240, 400, and 1000 grit sandpaper: https://amzn.to/33iOqrO
- Glazing putty (Bondo): https://amzn.to/3jlQKnj
- Spray putty: https://amzn.to/33gCKWk
- Filament Prusament PLA https://amzn.to/3AfFYs8

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Process:
1. Dry sand using 80, 120, and 240 grit sandpaper.
2. Wet sand using 400 and 1000 grit sandpaper.
3. Apply glazing putty (Bondo) to the most uneven parts.
4. Wet sand again using 400 and 1000 grit sandpapers.
5. Apply spray putty, wet sanding with 1000 grit sandpaper between coats.

Series:
Part 1: Glue    • Gluing a 3D Printed TESLA ROADSTER  
Part 2: Sandpaper and Putty    • Sanding a 3D Printed TESLA ROADSTER f...  
Part 3: Paint    • Spray Painting a 3D Printed TESLA ROA...  

Critique:
This test's main purpose was to review the constraints of printing a 3d model that was not meant to be printed. Although this is an extremely high-quality and beautiful model, it needs extra work to be 3d printable. For example, all the windows and lights were printed 1% to 5% smaller than the originally intended size because otherwise don't fit. The parts need a gutter between them, and these ones are exact to the millimeter which is not accurate on physical objects. The same with the wheels and brakes: I drilled the holes to be 1mm wider in order to fit everything together.

3D model by Sim3D_ https://cults3d.com/en/3d-model/art/t...
Music by Joakim Karud    / joakimkarud