Raspberry Pi 4 2U rack-mount Mark III for 18 Pi

Mark II (link) and Mark I (link)
With Mark III, I completely rethought the design, which allowed to:

• increase the number of raspberries in 2 rack units
• significantly reduce printing time and plastic consumption
• significantly reduce the time required for assembling and disassembling the server
• reduce the number of parts
• implement a modular design, which means that MARK III will be available in various modifications

Version for 14 Raspberry with SSD here:
Raspberry Pi 4 2U rack-mount Mark III for 14 Pi with 2.5" SSD

More details are available on my website uplab.pro (link)
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