AC/DC Socket Plug — EU Child-Safety Blanker

A child-safety blanking disc for EU Schuko / CEE 7/3

(grounded) and CEE 7/4 wall sockets. Drops into the round

recess and blocks both phase pin holes — kids can't push hairpins,

forks, or fingers into the live contacts.

Design

• Ø 38 mm round disc with a domed back face: 14 mm tall at the

•   rim, rising to 19 mm at the centre. The dome is the visible side

•   once seated.

• - Two large spherical finger pockets carved into the dome and

•   pushed out toward the rim — Ø ~18 mm bowls that bite ~3 mm into

•   the cylinder side wall for thumb-and-finger grip leverage. Pulling

•   the plug back out one-handed is easy.

• - U-shaped earth-pin slot opens through one edge of the disc rim

•   so the plug seats fully even on grounded (CEE 7/3 / Schuko)

•   sockets where the earth pin sticks up from the recess wall.

• - Lightning-bolt logo recessed into the dome surface as a 2-colour

•   AMS inlay. Pure decoration — the plug works the same single-colour.

What you print

Two-colour print via a coordinate-locked combined STL:

• socket_plug_acdc.stl— ASCII multi-solid (body + logo) for Bambu

•   Studio's Split to Parts. Recommended.

• - body.stl— filament A (dark dome) — single-colour fallback if

•   you don't have AMS, the bolt becomes a recess rather than a colour

•   inlay (still visible, just monochrome).

• - logo.stl— filament B (yellow bolt) — drop into the body's

•   recess if printing parts separately.

Bambu AMS workflow (recommended)

1. Import socket_plug_acdc.stlinto Bambu Studio.

2. 2. Right-click the imported object → Split to Parts.

3. 3. Two sub-parts named bodyand logoappear, locked at exact

4.    coordinates.

5. 4. Assign filament A (dark / structural) to body— black, dark

6.    grey, or anthracite contrast best with the yellow bolt.

7. 5. Assign filament B (accent) to logo— bright yellow, gold,

8.    or copper. The pictured pair is white body + yellow bolt.

9. 6. Slice. Print front face DOWN on the bed (= dome up). Finger

10.    pockets become concave bowls opening upward, no supports anywhere.

Print settings

• Bambu Lab P2S (or any 0.4 mm FDM)

• - 0.2 mm layer height, 3 walls, 15 % infill

• - PLA Basic

• - No supports

• - Print front face DOWN (dome up)

• - ~12 g per plug, ~30 min print time

Fitment

Designed for the European Schuko family (the round 38–40 mm

recess with two phase-pin holes and a vertical earth-pin slot at the

top of the recess wall). Confirmed fit: Czech / German / Austrian /

Dutch / Belgian wall sockets.

Won't fit: UK BS 1363 (rectangular pin pattern), Swiss SEV 1011

(triangular), Italian CEI 23-50 (linear three-pin), or any North

American socket. Different geometry entirely.

Source

Full parametric .scadis included. Variables at the top of the file

control:

• Plug diameter, rim height, dome apex height

• - Finger pocket Ø, position, depth

• - Earth-pin slot width / inner-end position

• - Lightning-bolt size, position, recess depth

If your socket recess is slightly tighter or looser, bump plug_d

by a few tenths of a mm and re-render.

Safety note

This is a passive blanker — it doesn't replace certified

child-safety shutters or RCDs, and it has no electrical insulation

rating. PLA is non-conductive but a 3D-printed part is not a

certified electrical safety device. Use it as one layer of

defence against curious toddler fingers, alongside socket shutters

and proper supervision.