Brackets and mounts
Servo Latch Mechanism
- Bounding box
- 100.5 × 50.0 × 30.9 mm
- Engine
- Precision B-rep
- Parameters
- 27
- Published
- November 2, 2026
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The prompt
Design a compact 3D-printable mechanical latch mechanism actuated by a micro servo motor. The device should have a rigid rectangular base with mounting holes for screws. On the left side, include a pivoting main lever arm connected by a steel pin or shoulder bolt. The lever should rotate approximately 45–60 degrees. Under the lever, integrate a spring-loaded locking latch that automatically engages when the lever is pressed down and releases when actuated by a servo-driven linkage. On the right side, mount a standard 9g micro servo (SG90/MG90S compatible) that drives a short connecting rod linked to the latch. Use a four-bar style linkage so the servo only needs about 30–45° of rotation to disengage the latch. Include bosses for threaded inserts or M3 screws, 0.3–0.5 mm clearances between moving printed parts, filleted edges for strength, and reinforced pivot points. The design should be optimized for FDM 3D printing without supports where possible. The assembly should consist of separate printable parts with metal fasteners for pivots and servo mounting. Output an editable parametric CAD model (STEP/Fusion 360) rather than only a mesh.
Parameters
| Name | Value | Range |
|---|---|---|
| Base Length | 100 mm | 80 – 160 |
| Base Width | 50 mm | 40 – 80 |
| Base Thickness | 4 mm | 3 – 8 |
| Mounting Hole Dia | 3.2 mm | 2.5 – 5 |
| Boss Outer Dia | 7 mm | 5 – 12 |
| Boss Height | 6 mm | 4 – 10 |
| Lever Arm Length | 45 mm | 30 – 70 |
| Lever Arm Width | 12 mm | 8 – 20 |
| Lever Arm Thickness | 5 mm | 3 – 8 |
| Lever Pivot Boss OD | 8 mm | 6 – 14 |
| Pivot Pin Bore | 3.2 mm | 2.5 – 5 |
| Print Clearance | 0.4 mm | 0.2 – 0.8 |
| Latch Pawl Length | 30 mm | 20 – 50 |
| Latch Pawl Width | 10 mm | 6 – 16 |
| Latch Pawl Thickness | 5 mm | 3 – 8 |
| Latch Hook Depth | 3 mm | 1.5 – 6 |
| Spring Pocket Dia | 4.5 mm | 3 – 7 |
| Spring Pocket Depth | 6 mm | 4 – 10 |
| Servo Body Length | 23 mm | 20 – 30 |
| Servo Body Width | 12.5 mm | 10 – 16 |
| Servo Body Height | 22 mm | 18 – 28 |
| Servo Tab Width | 32 mm | 26 – 40 |
| Servo Tab Thickness | 2.5 mm | 1.5 – 4 |
| Servo Mount Hole Dia | 2.1 mm | 1.8 – 3 |
| Connecting Rod Length | 25 mm | 15 – 45 |
| Connecting Rod Dia | 3 mm | 2 – 5 |
| General Fillet Radius | 1 mm | 0.5 – 3 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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