Print Fit & Tolerance · Free generator

T-slot fit carriage with relief channels

An adjustable T-slot carriage with separate neck and undercut fits, recessed mounting holes and bottom relief channels.

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Before you print

Body 76 x 64 x 28. T-slot runs along Y, undercut from Z=7 to 15 and neck from Z=15 to the top. Four accessory mounts on 52 x 42 centers. Print on a Y end so the T profile builds without a long horizontal roof; inspect the slicer before printing. Geometry has been digitally checked; this template has not been physically test-printed.

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Create a new owned Nora3D part document. Use millimeters, world XY as the base and +Z as height. Retain named native features and expose only the controls listed below.

1. Create **Core**, a 76 × 64 × 28 box, centered at X=0, Y=0, with its bottom at Z=0.
2. Create **Left mounting flange**, a 12 × 76 × 6 box, centered at X=-32, Y=0, with its bottom at Z=0.
3. Create **Right mounting flange**, a 12 × 76 × 6 box, centered at X=32, Y=0, with its bottom at Z=0.
4. Unite **Core**, **Left mounting flange**, **Right mounting flange** as **Carriage blank**. Require one connected result.
5. Create **Undercut**, a 18 × 80 × 8 box, centered at X=0, Y=0, with its bottom at Z=7.
6. Create **Neck**, a 10 × 80 × 18 box, centered at X=0, Y=0, with its bottom at Z=15.
7. Create **Bottom relief**, a 14 × 80 × 1 box, centered at X=0, Y=0, with its bottom at Z=0.
8. Create **Bolt -26 -21**, radius 2.6, height 32, initially along +Z, with its base center at (-26, -21, -1).
9. Create **Head -26 -21**, radius 4.5, height 4, initially along +Z, with its base center at (-26, -21, 24).
10. Create **Bolt -26 21**, radius 2.6, height 32, initially along +Z, with its base center at (-26, 21, -1).
11. Create **Head -26 21**, radius 4.5, height 4, initially along +Z, with its base center at (-26, 21, 24).
12. Create **Bolt 26 -21**, radius 2.6, height 32, initially along +Z, with its base center at (26, -21, -1).
13. Create **Head 26 -21**, radius 4.5, height 4, initially along +Z, with its base center at (26, -21, 24).
14. Create **Bolt 26 21**, radius 2.6, height 32, initially along +Z, with its base center at (26, 21, -1).
15. Create **Head 26 21**, radius 4.5, height 4, initially along +Z, with its base center at (26, 21, 24).
16. Subtract **Undercut**, **Neck**, **Bottom relief**, **Bolt -26 -21**, **Head -26 -21**, **Bolt -26 21**, **Head -26 21**, **Bolt 26 -21**, **Head 26 -21**, **Bolt 26 21**, **Head 26 21** from **Carriage blank**, consuming the tools; name the result **T-slot carriage**.

## Public controls

| Control | Default | Range | Step | Meaning |
| --- | ---: | --- | ---: | --- |
| Undercut width | 18 | 17.6–19.2 | 0.1 | Width of the broad internal T channel. |
| Neck width | 10 | 9.8–11.2 | 0.1 | Width of the open neck. |
| Bottom relief depth | 1 | 0.6–1.6 | 0.1 | Relief depth below the main carriage; it does not change the T profile. |

All unlisted dimensions, topology and feature order remain fixed. Radius controls are radii, not diameters. These are independent numeric ranges; do not introduce unsupported formula bindings or assume a fit standard from an example value.

Adjustable dimensions

Parameter	Default	Range	Step
Undercut width	18 mm	17.6–19.2 mm	0.1 mm
Neck width	10 mm	9.8–11.2 mm	0.1 mm
Bottom relief depth	1 mm	0.6–1.6 mm	0.1 mm