MMDVM Dual Hat Enclosure for USB connection

Compact Case for MMDVM Dual Hat (PCB-Only)
 

Give your MMDVM Dual Hat Hotspot the perfect standalone home! This case is designed exclusively for the HS Dual Hat PCB — the Raspberry Pi is not housed inside.

I run my Dual Hat connected to the Raspberry Pi via the USB Mini port, using a custom-flashed firmware for USB operation. The mmdvmhost software runs inside a container on the Pi, keeping it free for other roles like an FM-Funknetz node or EchoLink node.

Features

• Snap-fit design – PCB clicks securely into place with retaining clips.
• Tool-free assembly – cover snaps on and locks firmly.
• Perfect fit – tight tolerances keep the PCB steady (scale up slightly for a looser fit).
• Custom feet – print 4× in TPU, then glue or press-fit.
• LED visibility – thin cover section lets the Dual Hat’s LED bar shine through.

The case feet need to be printed four times (TPU recommended) and can either be glued or pressed into place. The LED bar of the Dual HS Hat remains visible, depending on the filament used, because the cover is made thinner in that area.

⚠ Important: The enclosure and the cover plate must be printed with enabled supports to print the clips correctly.

⚠ Important: The PCB fits very tightly into the case, and it must be pushed past the retaining clips. If you prefer a slightly looser fit, you may need to scale the case up by a few percent. However, increasing the size too much might cause the PCB to no longer align with the pin headers. You might also scrape a little bit off the clips (it fit for more board without additional modification).

⚠ Note: Case fits the PCB exactly — too much scaling can misalign the pin headers.