Burr / Gallery

Where CAD linting catches real mechanical mistakes.

These are Burr release artifacts rendered read-only. Each case shows the preview for context, but the actual trust signal is the receipt: declared design intent, measured facts, failed rules, and source-level repair hints.

Source: fraylabs/burr@burr-v0.29.0

Asset: burr-gallery-v0.29.0.zip

What this proves

Visual checks are not enough.

A model can look fine and still violate a declared design rule. Burr catches those rules in metadata and receipts: edge distance, missing shoulders, insert-pocket bottoms, spacing envelopes, slider clearance, relief counts, and artifact/source integrity.

cargo install burr --version 0.29.0
burr init my-part
cd my-part
uv sync
uv run python design.py
burr check .
burr explain .

Read quickstart Open caught mistake

Repair proof

Agent repair loop, backed by receipts.

Burr packages the failure, exact source hint, regenerated result, and passing receipt as release artifacts. Fray renders the proof without inventing any extra claims.

Actuator Housing Edge-Distance Repair

bad CAD -> Burr check -> explain fix order -> fixed CAD passes

pass

Before fails

After fails

Repaired

First fix

Move the loaded M3 holes inward or increase the surrounding housing size.

Suggested actions

m3_front_leftmove_feature.center_mmdelta [6, -4, 0] mm
Move m3_front_left from [-28, -8, 9] mm to [-22, -12, 9] mm so center-to-edge increases from 8 mm to at least 10.2 mm.
source: replace_python_dict_entry examples/build123d-actuator-housing-repair/bad/design.py features[id=m3_front_left].center_mm
edit
replace_python_dict_entry
file
examples/build123d-actuator-housing-repair/bad/design.py
selector
mount_holes["m3_front_left"]
value path
features[id=m3_front_left].center_mm
confidence
exact_from_design_data
before
"m3_front_left": (-28.0, -8.0, hole_z),
after
"m3_front_left": (-22.0, -12.0, hole_z),
after margin: 1.80 mm
m3_front_rightmove_feature.center_mmdelta [-6, -4, 0] mm
Move m3_front_right from [28, -8, 9] mm to [22, -12, 9] mm so center-to-edge increases from 8 mm to at least 10.2 mm.
source: replace_python_dict_entry examples/build123d-actuator-housing-repair/bad/design.py features[id=m3_front_right].center_mm
edit
replace_python_dict_entry
file
examples/build123d-actuator-housing-repair/bad/design.py
selector
mount_holes["m3_front_right"]
value path
features[id=m3_front_right].center_mm
confidence
exact_from_design_data
before
"m3_front_right": (28.0, -8.0, hole_z),
after
"m3_front_right": (22.0, -12.0, hole_z),
after margin: 1.80 mm
m3_rear_leftmove_feature.center_mmdelta [6, 4, 0] mm
Move m3_rear_left from [-28, 8, 9] mm to [-22, 12, 9] mm so center-to-edge increases from 8 mm to at least 10.2 mm.
source: replace_python_dict_entry examples/build123d-actuator-housing-repair/bad/design.py features[id=m3_rear_left].center_mm
edit
replace_python_dict_entry
file
examples/build123d-actuator-housing-repair/bad/design.py
selector
mount_holes["m3_rear_left"]
value path
features[id=m3_rear_left].center_mm
confidence
exact_from_design_data
before
"m3_rear_left": (-28.0, 8.0, hole_z),
after
"m3_rear_left": (-22.0, 12.0, hole_z),
after margin: 1.80 mm
m3_rear_rightmove_feature.center_mmdelta [-6, 4, 0] mm
Move m3_rear_right from [28, 8, 9] mm to [22, 12, 9] mm so center-to-edge increases from 8 mm to at least 10.2 mm.
source: replace_python_dict_entry examples/build123d-actuator-housing-repair/bad/design.py features[id=m3_rear_right].center_mm
edit
replace_python_dict_entry
file
examples/build123d-actuator-housing-repair/bad/design.py
selector
mount_holes["m3_rear_right"]
value path
features[id=m3_rear_right].center_mm
confidence
exact_from_design_data
before
"m3_rear_right": (28.0, 8.0, hole_z),
after
"m3_rear_right": (22.0, 12.0, hole_z),
after margin: 1.80 mm
housingresize_part_envelope.bbox_mm.size[1]delta 14 mm
Resize housing housing_width from 34 mm to 48 mm so the repaired hole centers keep positive edge-distance margin.
source: replace_python_assignment examples/build123d-actuator-housing-repair/bad/design.py parts[id=housing].bbox_mm.size[1]
edit
replace_python_assignment
file
examples/build123d-actuator-housing-repair/bad/design.py
selector
housing_width
value path
parts[id=housing].bbox_mm.size[1]
confidence
exact_from_design_data
before
housing_width = 34.0
after
housing_width = 48.0

m3_front_left

Reason: insufficient_edge_distance

Measured

hole diameter mm: 3.4

Required

center to edge diameter multiple: 3

before margin: -2.20 mm

m3_front_left

After status: ok

Measured

hole diameter mm: 3.4

Required

center to edge diameter multiple: 3

after margin: 1.80 mm

Report JSON Report Markdown

Lint failures

Mistakes Burr catches

These receipts fail on purpose: Burr catches a declared CAD mistake and keeps the preview separate from the proof.

Bad Bearing Seat Missing Shoulder

Visual: generated STEP preview

fail caught

Checks

Fails

Declared

Warnings

Linted features: 1

bearing_608_seat

Out of scope: 1

cosmetic_bearing_recess

Lint failures Burr caught: 1

bearing_608_seatDesign data declares a bearing seat, but matching seated pocket geometry was not found.Reason: missing_declared_feature
Measured
best seat axial distance mm
3.5
best seat centerline distance mm
0
best seat diameter delta mm
0
best shoulder plane distance mm
4
candidate cylinders
3
Required
centerline tolerance mm
0.25
seat axial tolerance mm
4
seat center tolerance mm
0.5
seat diameter mm
22
seat diameter tolerance mm
0.05

Visual checks are not enough.

Agent repair loop, backed by receipts.

Actuator Housing Edge-Distance Repair

Mistakes Burr catches

Bad Bearing Seat Missing Shoulder

Bad Dense Plate Too Few Reliefs

Bad Relief Envelope Thin Ligament

Bad T-Slot Slider Loose Clearance

Bad T-Slot Slider Tight Clearance

Bad T-Slot Slider Missing Capture Lip

Bad T-Slot Slider Shallow Capture Lip

Bad Dense Plate Too Many Reliefs

Bad Hole-Slot Thin Ligament

Bad Practical Insert Fit Tight

Bad Practical Driver Access Blocked

Bad Practical Mount Pattern Shifted

Bad Practical Snap Hook Thin

Bad Practical Boss Support Unsupported

Bad Slot Near Edge

Bad Counterbore Near Edge

Bad Insert Pocket Thin Back Wall

Bad Bearing Seat Near Edge

Bad Insert Pocket Near Edge

Bad Standoff Boss Near Edge

Bad Actuator Housing Edge Distance

Bad Boss Support Too Thin

Bad Standoff Boss Missing STEP

Bad Counterbore Missing Recess

Bad Insert Pocket Through Hole

Bad Slot Disconnected Holes

Designs Burr accepts

Shaft Bearing Bracket

Slotted Motor Plate

Edge-Safe Slot Mount

Edge-Safe Counterbore Mount

Back-Wall Safe Insert Pocket

Edge-Safe Bearing Seat

Edge-Safe Insert Pocket

Edge-Safe Standoff Boss

Electronics Standoff Deck

Boss-Supported M3 Mount

Dense Random-Hole Plate

Relief Envelope Plate

T-Slot Linear Slider

Practical Insert Fit Good

Practical Driver Access Good

Practical Mount Pattern Good

Practical Snap Hook Good

Practical Boss Support Good

Fixed Actuator Housing