### Illustrate UUID-Based Identification

Source: https://context7.com/librepcb-libraries/cnc_tech.lplib/llms.txt

Demonstrates the use of RFC 4122 UUIDs for globally unique identification and cross-referencing of library elements. Examples include component, package, and pad references.

```lisp
# Device references component and package by UUID
(component e9ea7610-0ef4-4855-9f9b-e7f77a28afa1)
(package 223030ff-b905-4811-b32d-b0174d431702)

# Pads reference signals by UUID
(pad 0e904dd2-071d-4c4e-8c73-621b8c977806 (signal 7717d67a-a14b-4bc2-8916-a3d88adb9fc0))
```

--------------------------------

### LibrePCB Package Metadata and Pad Declarations

Source: https://context7.com/librepcb-libraries/cnc_tech.lplib/llms.txt

Defines the physical footprint of a component, including its name, description, keywords, author, version, and creation date. It also categorizes the package and declares its pads, specifying their names.

```lisp
(librepcb_package 03c6717e-219d-4e91-a1da-636c886a0786
 (name "CNCTECH_3220-40-0300-XX")
 (description "40-pin 1.27mm pitch SMD IDC box header by CNC Tech.\n\nGenerated with librepcb-parts-generator (generate_idc.py)")
 (keywords "cnc tech,idc,header,male,box header,smd,3220,1.27mm")
 (author "Danilo Bargen")
 (version "0.2")
 (created 2019-07-09T21:31:21Z)
 (deprecated false)
 (generated_by "")
 (category 92186130-e1a4-4a82-8ce9-88f4aa854195)
 (category e4d3a6bf-af32-48a2-b427-5e794bed949a)
 (assembly_type smt)
 (pad 38231b30-bfc4-4cfd-b5a9-07dbcfeeb861 (name "1"))
 (pad bb467235-0491-4c27-894c-1b4a2e6f55a4 (name "2"))
 (pad ce3b269d-6266-448b-9883-48c6f28907bc (name "3"))
)
```

--------------------------------

### LibrePCB Library Root Configuration

Source: https://context7.com/librepcb-libraries/cnc_tech.lplib/llms.txt

Defines the main library metadata, author information, version, and dependencies for the CNC Tech component library. This configuration is essential for LibrePCB to recognize and utilize the library.

```lisp
(librepcb_library b3184c97-cd6d-4d0a-9a32-8ba71a5d3116
 (name "CNC Tech")
 (description "Connectors by CNC Tech (unofficial).")
 (keywords "cnc,cnctech,connectors")
 (author "LibrePCB")
 (version "0.1.1")
 (created 2019-07-09T19:27:44Z)
 (deprecated false)
 (url "https://github.com/LibrePCB-Libraries/CNC_Tech.lplib")
 (dependency 6ccc516c-21b7-4cd5-9cf2-7a04cfa361c6)
 (manufacturer "CNC Tech")
)
```

--------------------------------

### Create Component Orientation Marker

Source: https://context7.com/librepcb-libraries/cnc_tech.lplib/llms.txt

Creates a triangular polygon to indicate pin 1 location for proper component alignment. This marker is placed on the 'top_documentation' layer and is filled.

```lisp
(polygon bde82b3f-7309-470d-a16e-4c5fe2a09bb8 (layer top_documentation)
 (width 0.0) (fill true) (grab_area false)
 (vertex (position -1.93 15.22) (angle 0.0))
 (vertex (position -1.93 14.22) (angle 0.0))
 (vertex (position -1.237 14.72) (angle 0.0))
 (vertex (position -1.93 15.22) (angle 0.0))
)
```

--------------------------------

### LibrePCB Device Definition Format

Source: https://context7.com/librepcb-libraries/cnc_tech.lplib/llms.txt

Specifies device files that link component symbols to physical packages and define pad-to-signal mappings. This format is crucial for defining how a component behaves electrically and connects physically.

```lisp
(librepcb_device 00548426-b029-4fac-9b83-6f2a7e114e72
 (name "CNC Tech 3220-10-0300")
 (description "10-pin 1.27mm pitch SMD IDC box header by CNC Tech.\n\nGenerated with librepcb-parts-generator (generate_idc.py)")
 (keywords "cnc tech,idc,header,male,box header,smd,3220,1.27mm")
 (author "U. Bruhin")
 (version "0.2")
 (created 2019-10-19T10:11:49Z)
 (deprecated false)
 (generated_by "")
 (category 4a4e3c72-94fb-45f9-a6d8-122d2af16fb1)
 (component e9ea7610-0ef4-4855-9f9b-e7f77a28afa1)
 (package 223030ff-b905-4811-b32d-b0174d431702)
 (pad 0e904dd2-071d-4c4e-8c73-621b8c977806 (signal 7717d67a-a14b-4bc2-8916-a3d88adb9fc0))
 (pad 569d1761-063f-4ff4-9531-c28a87b23ec6 (signal b74f3cdc-5fe0-4f68-9207-b3921a3ec162))
 (part "3220-10-0300-00" (manufacturer "CNC Tech"))
 (part "3220-10-0300-00-TR" (manufacturer "CNC Tech"))
)
```

--------------------------------

### Define Package Outline

Source: https://context7.com/librepcb-libraries/cnc_tech.lplib/llms.txt

Defines the physical component boundary for assembly documentation using a polygon on the 'top_package_outlines' layer. The outline is not filled.

```lisp
(polygon e29c5354-9c0f-4164-8cf4-e54f2946702a (layer top_package_outlines)
 (width 0.0) (fill false) (grab_area false)
 (vertex (position -2.75 12.715) (angle 0.0))
 (vertex (position -2.555 12.715) (angle 0.0))
 (vertex (position -2.555 15.845) (angle 0.0))
 (vertex (position 2.555 15.845) (angle 0.0))
 (vertex (position 2.555 12.715) (angle 0.0))
 (vertex (position 2.75 12.715) (angle 0.0))
)
```

--------------------------------

### LibrePCB Documentation Layer Polygon

Source: https://context7.com/librepcb-libraries/cnc_tech.lplib/llms.txt

Defines a polygon on the documentation layer, used for visual representation of pad locations and component orientation on the PCB. It includes layer, width, fill properties, and vertex coordinates.

```lisp
(polygon f93875bb-8c61-48e8-bd9d-faf2f8331084 (layer top_documentation)
 (width 0.0) (fill true) (grab_area false)
 (vertex (position -0.44 12.26) (angle 0.0))
 (vertex (position -0.44 11.86) (angle 0.0))
 (vertex (position -2.75 11.86) (angle 0.0))
 (vertex (position -2.75 12.26) (angle 0.0))
 (vertex (position -0.44 12.26) (angle 0.0))
)
```

--------------------------------

### Implement Dynamic Text Elements

Source: https://context7.com/librepcb-libraries/cnc_tech.lplib/llms.txt

Utilizes 'stroke_text' elements to create dynamic text placeholders for component labeling on the PCB layout. These are defined for component names on 'top_names' and values on 'top_values'.

```lisp
(stroke_text 85a104d0-f9cf-405c-ac80-de6a023751a7 (layer top_names)
 (height 1.0) (stroke_width 0.2) (letter_spacing auto) (line_spacing auto)
 (align center bottom) (position 0.0 16.85) (rotation 0.0)
 (auto_rotate true) (mirror false) (value "{{NAME}}")
)
(stroke_text d3b9b569-8bc8-4e8c-a979-2dd8b68f3c54 (layer top_values)
 (height 1.0) (stroke_width 0.2) (letter_spacing auto) (line_spacing auto)
 (align center top) (position 0.0 -16.85) (rotation 0.0)
 (auto_rotate true) (mirror false) (value "{{VALUE}}")
)
```

--------------------------------

### LibrePCB Footprint Pad Geometry Definition

Source: https://context7.com/librepcb-libraries/cnc_tech.lplib/llms.txt

Defines the geometric properties of pads within a footprint, including their name, side, shape, position, rotation, size, and radius. This information is critical for accurate PCB layout and manufacturing.

```lisp
(footprint ffcff5e9-3843-429d-9a48-4437afd9acd4
 (name "default")
 (description "")
 (3d_position 0.0 0.0 0.0) (3d_rotation 0.0 0.0 0.0)
 (pad 38231b30-bfc4-4cfd-b5a9-07dbcfeeb861 (side top) (shape roundrect)
  (position -1.955 12.06) (rotation 0.0) (size 2.4 0.76) (radius 0.5)
  (stop_mask auto) (solder_paste auto) (clearance 0.0) (function standard)
  (package_pad 38231b30-bfc4-4cfd-b5a9-07dbcfeeb861)
 )
 (pad bb467235-0491-4c27-894c-1b4a2e6f55a4 (side top) (shape roundrect)
  (position 1.955 12.06) (rotation 0.0) (size 2.4 0.76) (radius 0.5)
  (stop_mask auto) (solder_paste auto) (clearance 0.0) (function standard)
  (package_pad bb467235-0491-4c27-894c-1b4a2e6f55a4)
 )
)
```

--------------------------------

### Define Silkscreen Legend Layer

Source: https://context7.com/librepcb-libraries/cnc_tech.lplib/llms.txt

Defines the visible component outline on the PCB silkscreen using a polygon element. The layer is set to 'top_legend' and the line width is 0.25.

```lisp
(polygon bac1ec15-cd2c-4e20-b909-b1cf612c12ce (layer top_legend)
 (width 0.25) (fill false) (grab_area false)
 (vertex (position -3.03 12.715) (angle 0.0))
 (vertex (position -2.68 12.715) (angle 0.0))
 (vertex (position -2.68 15.97) (angle 0.0))
 (vertex (position 2.68 15.97) (angle 0.0))
 (vertex (position 2.68 12.715) (angle 0.0))
)
```

--------------------------------

### Define Courtyard Area

Source: https://context7.com/librepcb-libraries/cnc_tech.lplib/llms.txt

Defines the keepout area around the component for DRC checks using a polygon on the 'top_courtyard' layer. This area is not filled.

```lisp
(polygon 9108def7-72c8-4d3d-bcd8-6aad59234da7 (layer top_courtyard)
 (width 0.0) (fill false) (grab_area false)
 (vertex (position -3.655 13.215) (angle 0.0))
 (vertex (position -3.055 13.215) (angle 0.0))
 (vertex (position -3.055 16.345) (angle 0.0))
 (vertex (position 3.055 16.345) (angle 0.0))
 (vertex (position 3.655 13.215) (angle 0.0))
)
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.