Customizable spray stencil text box

This is a parametric spray-paint stencil generator that creates a flat stencil plate with proper stencil breaks to stop letters from falling out.

The goal here was a clean military / crate-label style stencil that just works you can turn bridges off. Otherwise, the built-in stencil cuts handle it automatically.

Designed specifically for Makerworld’s Parametric Model Maker using OpenSCAD.

Features

• Custom text (up to 3 lines)
• internal islands supported
• Manual plate sizing for proper overspray control
• Optional autosize mode with configurable border
• Multiple bridge / stencil styles:
  • Off – clean cut (use with true stencil fonts)
  • Stencil – classic vertical stencil cuts (recommended)
  • Classic – a few horizontal support bars
  • Striped – heavy repeating bars for an industrial look
• Rounded corners for comfort and durability

Supported Stencil Fonts

If any of these fonts are present, you can use bridge style = Off for a true font-based stencil:

• Allerta Stencil
• Stardos Stencil:style=Bold
• Saira Stencil One

If none of these are available, the Stencil bridge style will produce the same functional result using common system fonts (Liberation / DejaVu).

Recommended Print Settings

• Material: PLA or PETG
• Layer height: 0.2 mm
• Infill: 100% or 3–4 perimeters
• Supports: lol
• Orientation: Flat on the build plate

For best results, use manual plate sizing so the stencil extends beyond the text and reduces overspray.

Version 5 – Major Parametric & UI Upgrade as of 2/17/2025

• Line spacing redesigned now set as a percentage of text height 
• Improved MakerWorld parameter layout with clean tab organization
• Added sliders with min/max limits to prevent invalid inputsyay 
• Manual size toggle upgraded to a clearer size mode selector
• Font selection converted to dropdown
• Fixed Stardos Stencil font handling for proper bold rendering
• Improved autosize calculation stability
• Added render quality control for smoother curves
• Better parameter validation to prevent zero-size or broken models
• Cleaner structure and improved compatibility with OpenSCAD

Huge Thanks to Christian

Massive shoutout to Christian (@zizzo81) for significantly improving this OpenSCAD file, restructuring the parameters, fixing warnings, improving MakerWorld integration, and making the model far more user-friendly and robust.

Check out his projects here:
https://makerworld.com/en/@zizzo81