Brackets and mounts
MGN12 Dovetail Linear Rail + PTFE-Slider Carriage
- Bounding box
- 30.0 × 15.5 × 300.0 mm
- Engine
- Precision B-rep
- Parameters
- 20
- Published
- September 24, 2026
Download
Free to download and use. See the terms.
The prompt
Design a 300 mm long, 3D-printable linear rail inspired by an MGN12H, for the Z-axis of a Creality Ender 3 V2. Use the uploaded MGN9 STEP model as the starting reference, but redesign it for MGN12 dimensions. The system must have: * One fixed 300 mm rail. * One removable sliding carriage. * EXACTLY two 4 mm OD PTFE tubes mounted inside the carriage as sliding elements. * The PTFE tubes must contact the rail and provide the sliding surfaces. * The rail must use a dovetail-like profile to prevent lateral movement and keep the carriage captured. * The carriage should be about 30–32 mm long and rigid enough for the Ender 3 V2 Z-axis. * Include adjustable FDM-printing clearances suitable for PETG. * Optimize the design for strength, low friction, and easy printing with minimal supports. Do not use bearings, wheels, ball bearings, or additional PTFE tubes.
Parameters
| Name | Value | Range |
|---|---|---|
| Rail Length | 300 mm | 100 – 500 |
| Rail Base Width | 8 mm | 6 – 10 |
| Rail Top Width | 12 mm | 10 – 16 |
| Rail Height | 8 mm | 5 – 10 |
| Mounting Hole Dia (M3 clearance) | 3.4 mm | 2.5 – 5 |
| Mounting Hole Spacing | 30 mm | 15 – 60 |
| Counterbore Dia | 6 mm | 4 – 9 |
| Counterbore Depth | 2.5 mm | 1 – 4 |
| Carriage Length | 31 mm | 22 – 45 |
| Carriage Width | 26 mm | 22 – 34 |
| Carriage Height | 15 mm | 13 – 22 |
| Dovetail Slide Clearance | 0.25 mm | 0.1 – 0.5 |
| Carriage Bottom Gap | 0.5 mm | 0.2 – 2 |
| Ribs per Side | 3 pcs | 1 – 5 |
| Rib Protrusion | 2 mm | 1 – 4 |
| Rib Width | 4 mm | 2 – 8 |
| PTFE Tube OD | 4 mm | 3 – 6 |
| PTFE Tube Length | 30 mm | 20 – 44 |
| Tube Preload into Rail | 0.2 mm | 0.05 – 0.5 |
| Tube Press-Fit into Groove | 0.05 mm | 0.01 – 0.2 |
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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