STEVEMIT
steve/t-slot-extrusion
T-slot aluminium extrusions with real cross-sections (2020, 2040, 3030, 3060, 4040, 4080; slot 5, 6, 8), any length.
steve/extrusion-corner-bracket
Corner bracket envelope for 2020, 3030 and 4040 extrusions: two flat legs at a right angle (simplified, no holes).
Isometric
Section analysis
Plane normal
Offset
| 1 | """Corner bracket for 20, 30 and 40 mm aluminium extrusions, simplified as step.parts' published models draw it: two |
| 2 | flat legs at a right angle, no holes. |
| 3 | |
| 4 | The legs stand on the XY plane and rise along +Z by the bracket's height (the extrusion size). One leg runs along +X, |
| 5 | the other along +Y, each `t` thick and centred on its axis, `leg` long from the origin; the small square at the |
| 6 | outside of the corner (-t/2..0, -t/2..0) is open, as in the models. |
| 7 | """ |
| 8 | from steve import Model |
| 9 | |
| 10 | series = "2020" # Extrusion series |
| 11 | variant = "single" # Leg length: single or double |
| 12 | material = "unspecified" # Material |
| 13 | |
| 14 | # mm, measured on step.parts' models corner_bracket_<series>_<variant>_simple (their outline, a polygon read edge by |
| 15 | # edge at mid-height, and their height): {series: (height, thickness t, {variant: leg length})} |
| 16 | BRACKETS = { |
| 17 | "2020": (20.0, 3.0, {"single": 30.0, "double": 40.0}), |
| 18 | "3030": (30.0, 4.5, {"single": 45.0, "double": 60.0}), |
| 19 | "4040": (40.0, 6.0, {"single": 60.0, "double": 80.0}), |
| 20 | } |
| 21 | MATERIALS = { |
| 22 | "unspecified": (None, None), # the models name no material |
| 23 | "aluminum": ("aluminum-generic", "#cfd2d6"), |
| 24 | "steel": ("steel-generic", "#7d8085"), |
| 25 | } |
| 26 | |
| 27 | height, t, legs = BRACKETS[series] |
| 28 | leg = legs[variant] |
| 29 | h = t / 2 |
| 30 | material_id, colour = MATERIALS[material] |
| 31 | |
| 32 | model = Model() |
| 33 | with model.sketch("outline_sketch", on="XY", name="Outline") as sk: |
| 34 | sk.polyline("outline", [(0, 0), (0, -h), (leg, -h), (leg, h), (h, h), (h, leg), (-h, leg), (-h, 0)]) |
| 35 | model.extrude("bracket", "outline_sketch", distance=height, name="Bracket") |
| 36 | if material_id: |
| 37 | model.material(material_id, color=colour) |
| 38 | result = model.result() |
| 39 |
| 1 | name = "steve/extrusion-corner-bracket" |
| 2 | version = "1.0.0" |
| 3 | runtime = "steve" |
| 4 | license = "MIT" |
| 5 | summary = "Corner bracket envelope for 2020, 3030 and 4040 extrusions: two flat legs at a right angle (simplified, no holes)." |
| 6 | description = """A simplified corner bracket for 20, 30 and 40 mm aluminium extrusions: two flat legs at a right angle, \ |
| 7 | as tall as the extrusion, in two leg lengths, without holes. Measured from step.parts' published models (MIT); no maker \ |
| 8 | or standard is behind them, so use it as an envelope in assemblies. |
| 9 | |
| 10 | Legs along +X and +Y from the origin, rising along +Z. Dimensions and attribution: see the README.""" |
| 11 | tags = ["bracket", "corner-bracket", "extrusion", "t-slot", "2020", "3030", "4040", "frame"] |
| 12 | |
| 13 | [parameters.series] |
| 14 | type = "choice" |
| 15 | default = "2020" |
| 16 | choices = ["2020", "3030", "4040"] |
| 17 | label = "Extrusion series" |
| 18 | |
| 19 | [parameters.variant] |
| 20 | type = "choice" |
| 21 | default = "single" |
| 22 | choices = ["single", "double"] |
| 23 | label = "Leg length" |
| 24 | description = "single: the shorter legs (1.5 x the series size); double: the longer ones (2 x)." |
| 25 | |
| 26 | [parameters.material] |
| 27 | type = "choice" |
| 28 | default = "unspecified" |
| 29 | choices = ["unspecified", "aluminum", "steel"] |
| 30 | label = "Material" |
| 31 | |
| 32 | [[presets]] |
| 33 | id = "corner-2020-double" |
| 34 | title = "Corner bracket 2020 (double, simplified)" |
| 35 | params = { series = "2020", variant = "double" } |
| 36 | aliases = ["2020 corner bracket", "2020 angle bracket", "L bracket 2020", "2020 extrusion bracket double"] |
| 37 | standard = "step.parts corner bracket model" |
| 38 | |
| 39 | [[presets]] |
| 40 | id = "corner-2020-single" |
| 41 | title = "Corner bracket 2020 (single, simplified)" |
| 42 | params = { series = "2020", variant = "single" } |
| 43 | aliases = ["2020 corner bracket", "2020 angle bracket", "L bracket 2020", "2020 extrusion bracket single"] |
| 44 | standard = "step.parts corner bracket model" |
| 45 | |
| 46 | [[presets]] |
| 47 | id = "corner-3030-double" |
| 48 | title = "Corner bracket 3030 (double, simplified)" |
| 49 | params = { series = "3030", variant = "double" } |
| 50 | aliases = ["3030 corner bracket", "3030 angle bracket", "L bracket 3030", "3030 extrusion bracket double"] |
| 51 | standard = "step.parts corner bracket model" |
| 52 | |
| 53 | [[presets]] |
| 54 | id = "corner-3030-single" |
| 55 | title = "Corner bracket 3030 (single, simplified)" |
| 56 | params = { series = "3030", variant = "single" } |
| 57 | aliases = ["3030 corner bracket", "3030 angle bracket", "L bracket 3030", "3030 extrusion bracket single"] |
| 58 | standard = "step.parts corner bracket model" |
| 59 | |
| 60 | [[presets]] |
| 61 | id = "corner-4040-double" |
| 62 | title = "Corner bracket 4040 (double, simplified)" |
| 63 | params = { series = "4040", variant = "double" } |
| 64 | aliases = ["4040 corner bracket", "4040 angle bracket", "L bracket 4040", "4040 extrusion bracket double"] |
| 65 | standard = "step.parts corner bracket model" |
| 66 | |
| 67 | [[presets]] |
| 68 | id = "corner-4040-single" |
| 69 | title = "Corner bracket 4040 (single, simplified)" |
| 70 | params = { series = "4040", variant = "single" } |
| 71 | aliases = ["4040 corner bracket", "4040 angle bracket", "L bracket 4040", "4040 extrusion bracket single"] |
| 72 | standard = "step.parts corner bracket model" |
| 73 |
Extrusion corner bracket (simplified)
A simplified corner bracket for 20, 30 and 40 mm aluminium extrusions: two flat legs at a right angle, as tall as the extrusion, without holes. For assemblies (envelope and position), not for the bracket's hole pattern.
Geometry
The legs stand on the XY plane and rise along +Z by the height. One leg runs along +X, the other along +Y, each t
thick and centred on its axis, leg long from the origin; the small square outside the corner (−t/2..0, −t/2..0) is
open, as in the models.
| Series | Height | t | Leg, single | Leg, double |
|---|---|---|---|---|
| 2020 | 20 | 3 | 30 | 40 |
| 3030 | 30 | 4.5 | 45 | 60 |
| 4040 | 40 | 6 | 60 | 80 |
Parameters
| Parameter | Meaning |
|---|---|
series |
2020, 3030, 4040 |
variant |
single (shorter legs) or double (longer legs) |
material |
unspecified (no material assigned), aluminum, steel |
Sources
These generic brackets name no maker and no standard covers them. The geometry was measured from the published reference models below (each model's outline, a polygon read edge by edge at mid-height, and its height), and every preset is checked against its own model: bounding box within 0.05 mm and volume within 2 %.
- step.parts,
corner_bracket_<series>_<variant>_simple(https://www.step.parts, repository https://github.com/earthtojake/step.parts, commit c6113328,catalog/step/): step.parts' own "analytic simplified" models, original project material under the repository's MIT licence (© 2026 earthtojake). They name no material, so the presets havematerial = "unspecified".
Simplifications (the models'): no holes, no slot keys, no gusset. The catalogue's gusseted brackets (a bar across one leg, not joining the legs) and its joining plates and motor plates (all the same plain 50 × 30 × 3 block) are not presets.
Preset list: from the step.parts catalogue (MIT), see library/NOTICE.md.
| 1 | # Extrusion corner bracket (simplified) |
| 2 | |
| 3 | A simplified corner bracket for 20, 30 and 40 mm aluminium extrusions: two flat legs at a right angle, as tall as the |
| 4 | extrusion, without holes. For assemblies (envelope and position), not for the bracket's hole pattern. |
| 5 | |
| 6 | ## Geometry |
| 7 | |
| 8 | The legs stand on the XY plane and rise along +Z by the height. One leg runs along +X, the other along +Y, each t |
| 9 | thick and centred on its axis, `leg` long from the origin; the small square outside the corner (−t/2..0, −t/2..0) is |
| 10 | open, as in the models. |
| 11 | |
| 12 | | Series | Height | t | Leg, single | Leg, double | |
| 13 | |---|---|---|---|---| |
| 14 | | 2020 | 20 | 3 | 30 | 40 | |
| 15 | | 3030 | 30 | 4.5 | 45 | 60 | |
| 16 | | 4040 | 40 | 6 | 60 | 80 | |
| 17 | |
| 18 | ## Parameters |
| 19 | |
| 20 | | Parameter | Meaning | |
| 21 | |---|---| |
| 22 | | `series` | `2020`, `3030`, `4040` | |
| 23 | | `variant` | `single` (shorter legs) or `double` (longer legs) | |
| 24 | | `material` | `unspecified` (no material assigned), `aluminum`, `steel` | |
| 25 | |
| 26 | ## Sources |
| 27 | |
| 28 | These generic brackets name no maker and no standard covers them. **The geometry was measured from the published |
| 29 | reference models** below (each model's outline, a polygon read edge by edge at mid-height, and its height), and |
| 30 | every preset is checked against its own model: bounding box within 0.05 mm and volume within 2 %. |
| 31 | |
| 32 | - **step.parts**, `corner_bracket_<series>_<variant>_simple` (https://www.step.parts, repository |
| 33 | https://github.com/earthtojake/step.parts, commit c6113328, `catalog/step/`): step.parts' own "analytic simplified" |
| 34 | models, original project material under the repository's **MIT** licence (© 2026 earthtojake). They name no |
| 35 | material, so the presets have `material = "unspecified"`. |
| 36 | |
| 37 | Simplifications (the models'): no holes, no slot keys, no gusset. The catalogue's gusseted brackets (a bar across one |
| 38 | leg, not joining the legs) and its joining plates and motor plates (all the same plain 50 × 30 × 3 block) are not |
| 39 | presets. |
| 40 | |
| 41 | Preset list: from the step.parts catalogue (MIT), see `library/NOTICE.md`. |
| 42 |
A simplified corner bracket for 20, 30 and 40 mm aluminium extrusions: two flat legs at a right angle, as tall as the extrusion, in two leg lengths, without holes. Measured from step.parts' published models (MIT); no maker or standard is behind them, so use it as an envelope in assemblies. Legs along +X and +Y from the origin, rising along +Z. Dimensions and attribution: see the README.
Extrusion corner bracket (simplified)
A simplified corner bracket for 20, 30 and 40 mm aluminium extrusions: two flat legs at a right angle, as tall as the extrusion, without holes. For assemblies (envelope and position), not for the bracket's hole pattern.
Geometry
The legs stand on the XY plane and rise along +Z by the height. One leg runs along +X, the other along +Y, each t
thick and centred on its axis, leg long from the origin; the small square outside the corner (−t/2..0, −t/2..0) is
open, as in the models.
| Series | Height | t | Leg, single | Leg, double |
|---|---|---|---|---|
| 2020 | 20 | 3 | 30 | 40 |
| 3030 | 30 | 4.5 | 45 | 60 |
| 4040 | 40 | 6 | 60 | 80 |
Parameters
| Parameter | Meaning |
|---|---|
series |
2020, 3030, 4040 |
variant |
single (shorter legs) or double (longer legs) |
material |
unspecified (no material assigned), aluminum, steel |
Sources
These generic brackets name no maker and no standard covers them. The geometry was measured from the published reference models below (each model's outline, a polygon read edge by edge at mid-height, and its height), and every preset is checked against its own model: bounding box within 0.05 mm and volume within 2 %.
- step.parts,
corner_bracket_<series>_<variant>_simple(https://www.step.parts, repository https://github.com/earthtojake/step.parts, commit c6113328,catalog/step/): step.parts' own "analytic simplified" models, original project material under the repository's MIT licence (© 2026 earthtojake). They name no material, so the presets havematerial = "unspecified".
Simplifications (the models'): no holes, no slot keys, no gusset. The catalogue's gusseted brackets (a bar across one leg, not joining the legs) and its joining plates and motor plates (all the same plain 50 × 30 × 3 block) are not presets.
Preset list: from the step.parts catalogue (MIT), see library/NOTICE.md.
-
1.0.0 Latest
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