About this 3D model

I made this storage case for my Arduino parts and other small parts. The bill of materials for 3D printed parts is : holder cover : 1 holder : 1 hinge : 2 small box : 4 large box : 1 small box cover : 4 large box cover : 1 handle holder : 1 Standard parts : bolt M3 x 20mm countersunk head : 1 bolt M3 x 15mm countersunk head : 4 nut M3 : 5