M5Stack IoT Base (CAT-M) → RAM Mount "B" 1" Ball Adapter

A simple, rugged adapter to mount an M5Stack IoT Base CAT-M to a RAM Mounts "B" size arm. It should work with any M5 IOT base that has the DIN RAIL.

The plate is the exact 54 x 54 mm footprint of the M5 and bolts flat onto the device's two M3 brass inserts (32 mm centre-to-centre) — the same inserts the DIN-rail clip uses.

A standard RAM "B" 1" (25.4 mm) ball sits on the opposite face. The screw heads inset flush into the
back so nothing snags.

WHY: I needed to vehicle-mount a cellular M5 device on a RAM arm. The stock DIN clip isn't great for a moving vehicle, and the two M3 inserts were right there — so the adapter just bolts straight on.

HARDWARE NEEDED

• 2x M3 pan-head machine screws, 13 mm long
  (5 mm threads into the M5's brass inserts; 8 mm sits in the plate)
• 1x RAM "B" size socket arm / mount (1" ball family)

ASSEMBLY

1. Remove the M5's DIN-rail clip if fitted (2 screws).
2. Sit the adapter's flat face against the back of the M5, ball facing out, screw holes lined up with the two brass inserts.
3. Drive the two M3 pan-head screws in from the ball side; the headsrecess flush into the plate.
4. Pop the ball into your RAM arm and clamp.

PARAMETRIC
The included .scad is fully parametric (OpenSCAD). If your device or
screws differ, edit the values at the top:

• plate_x / plate_y .... device footprint (default 54 x 54)
• screw_spacing ........ insert centre-to-centre (default 32 mm)
• screw_len / base_engage the plate thickness auto-computes from these
• ball_d ............... RAM ball diameter (25.4 = RAM "B"); drop
  0.2-0.4 mm if your rubber socket grips tight

There is also a part = "ball_coupon" option to print just the ball and
test the RAM socket fit before committing to the full print.

Designed in OpenSCAD. STL and source .scad included.