Available as an assembled Module and as a DIY project.
This Module is currently available.
Adapter panel to use 1U modules in 3U racks
With the help of this adapter panel three rows of 1U modules (Intellijel format) can be inserted into 3U Eurorack cases. Each row can hold up to 18 hp 1U modules. The adapter panel rests directly on the Eurorack rails and is 20 hp wide.
Two variants are available
https://fpb-synths.de/en/eurorack/1u-adapter
Front
Back
Filled front
Filled back