A customizable keyring in the style of a EU/UK/GB number plate.

These are perfect for labelling your keys, bag and other personal belongings.

Use your slicer's 'pause at height' or 'filament change' feature to create multicolored keyrings on a single extruder 3D printer.

Font

To use this project, you will require the Mandatory font by K-Type, which is 'free for personal use'. Please see the K-Type Licences page for details.

Once you have obtained your copy of the Mandatory font, simply place the font file (Mandatory.otf) in the same directory as the .SCAD file included with this project.

If you see the following (or similar) errors in OpenSCAD, check the name and location of the font file:

WARNING: Can't open library 'Mandatory.otf'.
ERROR: Can't read font with path 'Mandatory.otf'
Execution aborted

OpenSCAD Customizer Options

This design has the following Customizer options:

Text

• Text - The text
• Inset_Text - Should text be inset?
• Text_Thickness - Thickness of the text

Plate

• Plate_Width - Width of the plate (excluding border)
• Border_Width - Width of the border
• Plate_Thickness - Thickness of the plate
• Additional_Border_Thickness - Additional material thickness of border

Keyring

• Keyring_Hole - Should a keyring hole be added?
• Hole_Diameter - Diameter of the hole
• Hole_Border_Width - Thickness of the material around the hole

Other

• Priming_Block - Add a priming block (for multi-filament prints)
• Priming_Block_Diameter_Percent - Diameter of the priming block
• Priming_Block_X_Offset_Percent - Priming block X offset as percentage of distance from center
• Priming_Block_Y_Offset_Percent - Priming block Y offset as percentage of distance from center

Multicolor keyrings with a single extruder 3D printer

If you'd like to print with multiple filaments:

• Make a note of the Text_Thickness and Plate_Thicknesssettings you've used.
• Consider adding a Priming_Block. The idea is that, at the start of each layer, your printer should print this first. This will help to ensure the filament is flowing nicely after a filament change, before starting to print with the new filament.
• You can adjust the size and position of the Priming Block to suit your needs. Don't make it too large though, as you'll be wasting filament.
• Print using your slicer's 'pause at height'/'filament change' feature, ensuring to switch the filament somewhere between the desired heights. In Cura this can be found under: Extensions > Post Processing > Modify G-Code > Add a script

Versions

• 1.0 (25 Feb 2021) - Initial version
• 1.1 (16 Aug 2022) - Added `Additional_Border_Thickness` option
• 1.2 (20 Aug 2022) - Fixed priming block height calculation
• 1.3 (6 Dec 2023) - Updated for Mandatory font Version 5 (2023) (OTF)

Printing

Recommended slicer settings:

• Resolution: 0.1mm - 0.2mm
• Infill: ~20%
• Supports: No
• Rafts: Should not be required unless you experience adhesion issues.

Attribution

The example keyrings shown in this project use the Mandatory font and are shared with permission from K-Type.

License

The "Personalised Number Plate Keyring" code (.scad) is licensed under The MIT License by Code and Make.

To use this project, you will require the Mandatory font by K-Type, which is 'free for personal use'. Please see the K-Type Licences page for details.

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