For my custom PC boot project I created this flexible and 3D printable rack mount case which is tailored for the DIGITUS 1U shelve (DIGITUS Professional DN-19 TRAY-1-SW).
You can fit a total of two on a single 1U shelve.
The frame can take custom front and rear insets which can hold different modules and keystones. Some examples are uploaded in Fusion360 format for own customizations for example a tool-less keystone system.
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The author marked this model as their own original creation.