Brackets and mounts
Marble Run Mechanism Set (Rocker Cup, Release Lever, Bell Striker)
- Bounding box
- 120.0 × 25.0 × 23.0 mm
- Engine
- Precision B-rep
- Parameters
- 29
- Published
- October 27, 2026
Download
Free to download and use. See the terms.
The prompt
1. Counterweighted Seesaw Rocker Cup Prompt: A mechanical balance rocker arm for a marble run, 3D printable STL. Features a small cylindrical receiving cup on one end sized for a 0.75-inch sphere, a central horizontal shaft hole for a pivot dowel pin, and a solid counterweight on the opposite end. Flat base, clean geometry, watertight mesh, no overhangs. 2. One-Handed Starting Release Lever Prompt: A mechanical one-handed marble release latch mechanism, 3D printable STL. Includes a shallow U-shaped channel track with a circular detent pocket to hold a 0.75-inch marble, and an integrated pivoting spring-loaded thumb trigger pin to release the marble when pressed. 3. Spring-Loaded Bell Striker Hammer Prompt: A spring-actuated mechanical hammer striker arm, 3D printable STL. Consists of a pivoting striker arm with a weighted mallet head on one end, a small trip-latch catch pin at the base, and mounting eyelets for a small tension spring.
Parameters
| Name | Value | Range |
|---|---|---|
| Rocker Arm Length | 120 mm | 60 – 200 |
| Rocker Arm Width | 25 mm | 15 – 50 |
| Rocker Arm Thickness | 15 mm | 8 – 30 |
| Sphere Cup Inner Dia (0.75 in) | 19.05 mm | 12 – 32 |
| Cup Pocket Depth | 10 mm | 3 – 18 |
| Pivot Dowel Hole Dia | 5 mm | 2 – 12 |
| Counterweight Block Length | 32 mm | 10 – 60 |
| Counterweight Block Height | 8 mm | 2 – 25 |
| Counterweight Top Fillet | 2 mm | 0 – 4 |
| Track Length | 80 mm | 40 – 150 |
| Track Overall Width | 22 mm | 14 – 50 |
| Track Overall Height | 12 mm | 8 – 30 |
| Base Plate Thickness | 5 mm | 2 – 12 |
| Side Wall Thickness | 1 mm | 0.8 – 4 |
| Detent Pocket Dia | 19.05 mm | 10 – 32 |
| Detent Pocket Depth | 4 mm | 1 – 10 |
| Thumb Trigger Pin Dia | 6 mm | 3 – 12 |
| Thumb Trigger Pin Length | 13 mm | 5 – 30 |
| Trigger Mount Lug Height | 15 mm | 8 – 30 |
| Striker Arm Length | 90 mm | 50 – 200 |
| Striker Arm Width | 12 mm | 6 – 30 |
| Striker Arm Thickness | 8 mm | 4 – 20 |
| Mallet Head Dia | 20 mm | 10 – 50 |
| Mallet Head Length | 16 mm | 8 – 40 |
| Arm Pivot Hole Dia | 6 mm | 2 – 15 |
| Trip-Latch Catch Pin Dia | 4 mm | 2 – 10 |
| Catch Pin Protrusion | 10 mm | 2 – 25 |
| Spring Eyelet Hole Dia | 3 mm | 1 – 8 |
| Exploded Layout Gap | 20 mm | 2 – 100 |
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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