Available as an assembled Module and as a DIY project.
This Module is currently available.
1u to 3u Adapter (Intellijel)
1u to 3u Adapter Intellijel format can fit up to 22hp of 1u modules inside using m3 screws and m3 nuts under the adapter and are 8hp wide.
Made of pcb material black and silver hasl
https://abyssdevices.com/product/eurorack-3u-to-1u-and-1u-to-3u-intellijel-and-pulplogic-formats/
2 Users are observing this
These merchants probably sell this module. Huh?