5 to 15 % Infill
0.15 to 0.2 mm Layer Height
Negative horizontal expansion is recommended: -0,02 mm to -0,06 mm
The file is set 350 mm long for better results, but if you have less volume printer, scale the mesh.
Use glue to glue nails' heads.
*If you have trouble engaging the nails, use hot air to soften them a little.
IMPORTANT NOTE: Be Careful. The Nails can harm, use smoothed nails to prevent this. Even so, this toy should not be used to harm anyone, it can do a lot of harm. Use under adult supervision.