I wanted to replace my NAS with a custom unraid server. But i couldn't find a computer case, that meets my requirements and fits in my server cabinet. So I designed and built my own modular case.

• Modules (combine like you want) 
  • CPU module for Mini ITX mother board und ATX power supply
    • Mother board slides in on an extra mount
  • SSD module for 10x 2,5" solid state disks
  • HDD module for 6x 3,5" hard disks
  • Fan module for 200mm PC case fan
  • Damping feet for vibration reduction
  • Custom SSD tray
  • Custom HDD tray optimized for vibration reduction
  • Dummy SSD and HDD for empty slots to preserve optimal air flow and hold free sata connectors
• Strength
  • Added wall loops and shell layers
  • Modules mounted together with heavy duty dovetails
  • Optimized stiffness per design where possible
  • NOT optimized to save filament or printing time
• Cable Management
  • All connectors on the front
    • Power supply and motherboard IO panel connectors front facing
    • SATA cables connected from front side (like a network patch panel)
  • Ribs with mounts for cable ties nearly everywhere inside the modules
• Air flow
  • Big 200mm fan for drive and case cooling
  • Air flow concept optimized for the vents in my cabinet
    • Takes in air from the sides
    • Blows out on front and top
• Assembly 
  • Dovetail to hold modules together
  • Screwed together using M4 screws and heat inserts
  • Back covers fixed with M3 screws and heat inserts
  • TPU feet fixed with M4 screws and heat inserts

Part List

• CPU module (printed PETG)
  • 2x M4 heat insert for front dovetail
  • Back cover (printed PETG)
    • 6x M3 heat insert and M3x4 cylinder head screw for back cover
  • 4x damping feet (printed TPU)
    • 4x M4 heat insert and M4X8 screw with wide head or washer for feet
  • 1x CPU slide and IO Panel (printed PETG)
    • 2x M3 heat insert and M3x4 cylinder head screw for IO panel
    • 4x M4 heat insert and M4x8 cylinder head screw for Motherboard
  • 1x M3 heat insert for motherboard slide mounting
  • 1x 16mm PC Case Host Switch like this
• SSD module (printed PETG)
  • 2x M4 heat insert and M4x8 cylinder head screw for front dovetail
  • Back cover (printed PETG)
    • 4x M3 heat insert and M3x4 cylinder head screw for back cover
  • 2x damping feet (printed TPU)
    • 2x M4 heat insert and M4X8 screw with wide head or washer for feet
  • 10x SSD tray (printed TPU)
  • Dummy SSD (printed PETG) for empty slots
• HDD module (printed PETG)
  • 2x M4 heat insert and M4x8 cylinder head screw for front dovetail
  • Back cover (printed PETG)
    • 4x M3 heat insert and M3x4 cylinder head screw for back cover
  • 2x damping feet (printed TPU)
    • 2x M4 heat insert and M4X8 screw with wide head or washer for feet
  • 6x HDD tray (printed TPU)
  • Dummy HDD (printed PETG) for empty slots
• Fan module (printed PETG)
  • 2x M4x8 cylinder head screw for front dovetail