"TANK" rugged Capsule

introducing “TANK” the small but heavily rugged capsule/container for any kind of outdoor usage.                                                                                                                                                        

waterproof against rain when using O-ring with dimension 3.5mm x 31.7mm (ID). I have included some STL- file of such ring for reference but if available buy it from your local hardware store.

• 0.2mm Layer 
• 2-3 shells for rigidity 
• infill ~30% or more
• cap need support 
• PLA/PETG/ABS