Raspberry Pi 4B/3B+/3B Cluster Case with Fan Kit, 1- 5 layer Multi Layer Acrylic Shell / Enclosure for Raspberry Pi 3 Model B+(Plus)/3B raspberry pi 3 b+ tower [Overview]Support customization: 5-Layers, 4-Layers, 2-layer, Single layer, ect. Forthermore, you can buy the Mid shell kit or cooling fan separately to build 6
Cluster Enclosure for 4x Raspberry Pi, UCTRONICS AC-RM0002
GeeekPi Raspberry Pi 4 Cluster Case, Raspberry Pi 4 India
GeeekPi Raspberry Pi 4 Cluster Case, Raspberry Pi 4 Tanzania
Raspberry Pi 4/3B+/3B Cluster Case with Fan Kit
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8 SLOT CLUSTER Cloudlet:For Raspberry Pi 4B, 3B+ and other single board computer £83.16 - PicClick UK
Rack Tower 4 Layer Acrylic Cluster Case Super Large Cooling Fan Led Rgb Light For Raspberry Pi 4 B / 3 B + / 3 B / Jetson Nano - Demo Board Accessories - AliExpress
GeeekPi Cluster Case for Raspberry Pi, Pi Rack Case Stackable Case with Cooling Fan 120mm RGB LED 5V Fan for Raspberry Pi 4B/3B+/3B/2B/B+ and Jetson Nano (12-Layers) : Electronics
GeeekPi Rack Tower, 4-Layer Enclosure for Raspberry Pi Cluster - digitec
Raspberry Pi 4/3B+/3B Cluster Case with Fan Kit
1U Rackmount Cluster - Raspberry Pi 3B+ / 4B by JaredC01, Download free STL model