Stevenson Screen for Aqara WSDCGQ11LM (Modular, Wall/Pipe Mount)

Intro

A compact, modular Stevenson screen designed specifically for the Aqara WSDCGQ11LM square temperature & humidity sensor.

The sensor installs into the Lower Part using a snap-in cradle with a latch (no screws or glue) and can be removed anytime without damage.

Key features

• Modular louver stack: choose the number of Lamella parts to adjust height.

• Default build (my setup): 9× Lamella → internal height ~90 mm (from bottom inner wall to top inner wall).

• No supports required for any part (as designed).

• Quick-release mounting: Arm uses a dovetail slide, so you can remove the whole screen without uninstalling the mount.

• Optional locking panels add extra safety against the dovetail sliding out over time.

Parts list

Files (what’s included)

• Cap

• Lamella

• Lamella lower

• Lower Part

• Arm

• Pipe bracket front

• Pipe bracket rear

• Pipe locking panel (optional)

• Flat mount

• Flat mount locking panel (optional)

Printed parts (what each part does)

Cap — top rain cover; installs on top of the last Lamella and is glued in place; tongue-and-groove prevents rain ingress.

Lamella — main louver element; tongue-and-groove stack, glued together. Height of one lamella: 8 mm; wall angle: 45°.

Lamella lower — top “base lamella”; Lamella stack glues into it; on the bottom side you install 4× M3×5 heat-set inserts for bolting to Lower Part.

Lower Part — holds the Aqara WSDCGQ11LM (snap-in cradle with latch) and serves as the base where the lamella stack mounts; this part is glued to Arm.

Arm — bracket that glues to Lower Part; includes the dovetail that slides into the pipe mount or flat mount.

Pipe bracket front — half of the clamp for a 65 mm OD pipe; includes dovetail socket; has 2 holes for M3×5 heat-set inserts (for optional locking panel).

Pipe bracket rear — rear half that tightens the clamp around a 65 mm OD pipe; connects to Pipe bracket front with 4× M4 screws.
Pipe locking panel (optional) — locks the dovetail on the pipe mount using 2× M3 screws (recommended for outdoor use).

Flat mount — wall/flat-surface mount with dovetail socket; can be locked with Flat mount locking panel.
Flat mount locking panel (optional) — locks the dovetail on the flat mount using 2× M3 screws.

Non-printed parts (hardware / supplies)

• Heat-set inserts: M3 × 5 mm

• 4× for Lamella lower

• 2× for Pipe bracket front (only if using Pipe locking panel)

• Screws:

  • 4× M3 screws for Lamella lower → Lower Part (M3×8 to M3×10 typically works; I cut mine to fit)

  • 2× M3 screws for the locking panel (M3×8 to M3×10 typically works; I cut mine to fit)

  • 4× M4 screws for Pipe bracket front + rear (length as needed)

• Glue:

  • Epoxy (I used Kafuter A+B), or any suitable epoxy; for ABS you can also use a solvent-based approach.

Recommended filament (outdoor)

PETG or ABS recommended (not PLA).

Print settings (baseline)

• Layer height: 0.2 mm

• Cooling: maximum on overhangs

• Supports: not required

• Brim: not required (tested with PETG)

• Infill: not important (choose what you prefer)

Assembly

1. Print all parts.
2. Install M3×5 heat-set inserts into Lamella lower (4 pcs) and Pipe bracket front (2 pcs, only if using the pipe lock).
3. Glue the louver stack into one rigid piece: Lamella lower + Lamella × N + Cap (glue all tongue-and-groove joints).
4. Bolt the finished louver stack to Lower Part using 4× M3 screws.
5. Glue Arm to Lower Part (make it a single solid assembly).
6. Install the sensor into Lower Part (snap-in cradle + latch; tool-free).

Mounting options

• Pipe mount (65 mm OD):

  • Clamp Pipe bracket front + rear on the pipe using 4× M4 screws.

  • Slide the Arm into the dovetail socket.

  • (Optional) Install Pipe locking panel and secure with 2× M3 screws.
    

• - Flat / wall mount:

  • Attach Flat mount to the surface (hardware depends on your wall).

  • Slide the Arm into the dovetail socket.

  • (Optional) Install Flat mount locking panel and secure with 2× M3 screws.

Installation notes

Best installed outdoors in an open location with good airflow/ventilation.
Sun exposure is OK: the screen is intended to shield the sensor from direct sun and rain while allowing air to circulate.