Brackets and mounts
3-Wheeled Robotic Trolley Chassis
- Bounding box
- 307.0 × 206.0 × 100.0 mm
- Engine
- Precision B-rep
- Parameters
- 25
- Published
- November 2, 2026
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The prompt
Generate a parametric 3D CAD model of a 3-wheeled robotic trolley chassis designed for 3D printing, optimized for a mobility aid prototype. The assembly consists of a main electronics housing base and an integrated top sensor deck. Overall Dimensions: 280mm length, 190mm width, 100mm height. 1. Main Base Design: - Create a rectangular hollow enclosure utilizing a 4mm wall shell thickness to ensure structural integrity for 3D printing. - At the bottom interior, include 4 vertical mounting standoffs with M3 pre-tapped screw holes arranged in a 48mm x 26mm rectangular pattern to securely mount a standard ESP32 development board. - Leave adequate interior clearance for a 12V rechargeable battery pack. 2. Drivetrain and Wheel Integration: - On the lower rear-left and rear-right lateral faces, extrude symmetric cylindrical cutouts with a 25mm diameter to serve as pass-through mounting points for two DC encoder motors. - The front section of the chassis must taper into a reinforced flat platform featuring a 3-hole bolt pattern designed to mount a heavy-duty swiveling front caster wheel. 3. Top Deck and LIDAR Mount: - The top surface must feature an integrated, elevated cylindrical pedestal centered on the deck, measuring 75mm outer diameter and 30mm height, to provide a clear line-of-sight for a LIDAR sensor. - The pedestal must have a 35mm hollow center bore for data and power wire routing down into the main electronics bay. - Include 4 countersunk screw holes on the top rim of the pedestal spaced equally at 90-degree intervals to accommodate a LIDAR mounting bracket. 4. Ergonomic Handle Interface: - At the rear of the chassis frame, integrate a reinforced mechanical socket attachment (30mm internal diameter, 40mm depth) intended to receive a vertical aluminum or 3D-printed trolley handle tube. Manufacturing constraints: Ensure all overhanging geometries feature 45-degree chamfers or native support lips to ensure clean, support-free or low-support FDM 3D printing. Output the final geometry as a watertight, manifold STEP or IGES file format.
Parameters
| Name | Value | Range |
|---|---|---|
| Base Length | 280 mm | 200 – 400 |
| Base Width | 190 mm | 150 – 250 |
| Base Height | 66 mm | 40 – 100 |
| Wall Thickness | 4 mm | 2 – 8 |
| Motor Cutout Diameter | 25 mm | 10 – 40 |
| Motor Y Offset from Center | 47.5 mm | 20 – 80 |
| Motor Z Center from Bottom | 25 mm | 5 – 50 |
| Caster Bolt Hole Diameter | 3.2 mm | 2 – 6 |
| Caster Bolt X Position | 260 mm | 200 – 280 |
| Caster Y Center | 95 mm | 50 – 150 |
| Caster Y Spacing | 47.5 mm | 20 – 80 |
| Handle Socket Diameter | 30 mm | 20 – 50 |
| Handle Socket Depth | 40 mm | 20 – 60 |
| Handle Socket Z Center | 40 mm | 20 – 60 |
| Standoff Outer Diameter | 6 mm | 4 – 10 |
| Standoff Hole Diameter (M3 tap drill) | 2.5 mm | 2 – 3 |
| Standoff Height | 5 mm | 3 – 12 |
| Standoff X Offset (±) | 24 mm | 10 – 100 |
| Standoff Y Offset (±) | 13 mm | 5 – 50 |
| Deck Plate Thickness | 4 mm | 2 – 8 |
| Pedestal Outer Diameter | 75 mm | 40 – 120 |
| Pedestal Height | 30 mm | 10 – 60 |
| Pedestal Bore Diameter | 35 mm | 10 – 60 |
| Pedestal Bolt Hole Diameter | 3.2 mm | 2 – 5 |
| Pedestal Bolt Hole Radius (from center) | 35 mm | 20 – 45 |
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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