Gears and transmission
Line Follower Chassis
- Bounding box
- 120 × 161 × 31 mm
- Engine
- 3D Printing B-rep
- Parameters
- 22
- Published
- November 5, 2026
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The prompt
Design a 3D-printable modular robot chassis for a line-following robot, consisting of a main rear-axle body, an extended central spine, a rear caster wheel mount, and a front sensor bracket, matching the following specifications: 1. Rear Axle & Motor Housing Section: - A horizontal central cylindrical or rectangular housing block designed to hold dual micro gear motors (N20 style) on the left and right sides. - Overall width across outer motor slots: approximately 120 mm. - A flat mounting deck integrated on top of the rear housing to secure a microcontroller board (such as an Arduino Nano / custom MCU layout) with screw mounting holes spaced at standard 23mm x 45mm dimensions. 2. Rear Caster Wheel Mount: - Integrated centrally at the rear bottom edge of the motor housing (extending backward slightly beneath the axle). - Features a flat horizontal mounting flange with two pre-modeled 3mm screw holes spaced 12mm apart to attach a standard mini ball caster or omni-directional wheel. 3. Central Spine Extension: - A rigid, flat structural arm extending forward from the center of the rear motor housing (length: approximately 80 mm, width: approximately 25 mm). - Designed with an internal structural lattice/truss pattern (intersecting diagonal ribs/X-braces) with a solid outer border and a thickness of 4 mm for optimized strength and reduced filament usage. 4. Front Sensor & Indicator Bracket: - At the front end of the spine, a T-shaped or curved horizontal sensor mounting bar (width: approximately 70 mm) designed to hold line-tracking sensor arrays and forward-facing status LEDs. - Includes pre-modeled vertical alignment pins or mounting holes spaced for standard infrared line-follower sensor modules (e.g., TCRT5000 arrays). 5. 3D Printing & Engineering Constraints: - Designed as a single solid manifold mesh with a flat bottom surface for clean bed adhesion without requiring complex support structures. - Wall thicknesses: Minimum 3 mm for structural rigidity. - Tolerances: Include integrated internal wire routing channels running from the front sensor board back to the main microcontroller deck.
Parameters
| Name | Value | Range |
|---|---|---|
| Spine length | 80 mm | 50 – 150 |
| Overall width across motor slots | 120 mm | 80 – 160 |
| Spine / bracket thickness | 4 mm | 2 – 8 |
| Motor pocket centre spacing | 96 mm | 60 – 118 |
| Caster relief recess diameter | 16 mm | 8 – 30 |
| Housing depth | 52 mm | 34 – 80 |
| Housing height | 26 mm | 16 – 40 |
| Motor pocket width | 14 mm | 10 – 24 |
| Motor pocket height | 12 mm | 8 – 20 |
| Deck plate width | 56 mm | 30 – 100 |
| Deck plate depth | 56 mm | 30 – 100 |
| Deck plate thickness | 5 mm | 3 – 10 |
| MCU hole spacing X | 23 mm | 10 – 60 |
| MCU hole spacing Y | 45 mm | 10 – 80 |
| Spine width | 25 mm | 15 – 60 |
| Solid outer border width | 5 mm | 3 – 10 |
| Diagonal rib width | 3 mm | 2 – 6 |
| Number of truss bays | 4 mm | 2 – 8 |
| Sensor bar width | 70 mm | 40 – 100 |
| Sensor bar depth | 18 mm | 10 – 40 |
| Sensor module hole spacing | 30 mm | 10 – 60 |
| LED hole spacing | 56 mm | 20 – 90 |
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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