Feature Request: 1:1 Real-World Scale STL Preview on Monitor #1915

New Issue

MrUnknownDE · 2026-04-05T21:12:28+02:00

MrUnknownDE commented

2026-04-05 21:12:28 +02:00

Originally created by @dexterchock on 10/14/2025

Is there an existing issue for this feature request?

I have searched the existing issues

Sometimes it’s hard to judge the actual physical size of a model just by looking at it on screen.
A 1:1 real-world scale preview would make it easier to understand how big a part really is before printing.

Which printers will be beneficial to this feature?

All

Describe the solution you'd like

Add an option in OrcaSlicer to display models at true 1:1 real-world scale on the monitor. This lets users see the actual physical size of a part directly on screen — great for checking fit, proportions, or general feel before printing.

Describe alternatives you've considered

Add a Monitor Calibration option in Preferences:
- User enters screen diagonal size (in inches or mm).
- User enters screen resolution (e.g. 2560×1440).
- Or show a calibration ruler users can measure to fine-tune scaling.
OrcaSlicer calculates pixel density (PPI):
[
PPI = \frac{\sqrt{Width_{px}^2 + Height_{px}^2}}{Diagonal_{inches}}
]
Example: 27” 2560×1440 monitor = ~109 PPI → 1 mm ≈ 4.29 px.
When “1:1 Scale Preview” is enabled:
- Switch the viewport to orthographic mode.
- Scale so 1 mm in model = 1 mm on screen.
- The user can hold an object or ruler to compare actual size.

Additional context

No response

*Originally created by @dexterchock on 10/14/2025* ### Is there an existing issue for this feature request? - [x] I have searched the existing issues ### Is your feature request related to a problem? Sometimes it’s hard to judge the actual physical size of a model just by looking at it on screen. A 1:1 real-world scale preview would make it easier to understand how big a part really is before printing. ### Which printers will be beneficial to this feature? All ### Describe the solution you'd like Add an option in OrcaSlicer to display models at *true 1:1 real-world scale* on the monitor. This lets users see the actual physical size of a part directly on screen — great for checking fit, proportions, or general feel before printing. ### Describe alternatives you've considered 1. Add a **Monitor Calibration** option in Preferences: - User enters **screen diagonal size** (in inches or mm). - User enters **screen resolution** (e.g. 2560×1440). - Or show a calibration ruler users can measure to fine-tune scaling. 2. OrcaSlicer calculates **pixel density (PPI)**: \[ PPI = \frac{\sqrt{Width_{px}^2 + Height_{px}^2}}{Diagonal_{inches}} \] Example: 27” 2560×1440 monitor = ~109 PPI → 1 mm ≈ 4.29 px. 3. When “1:1 Scale Preview” is enabled: - Switch the viewport to **orthographic** mode. - Scale so **1 mm in model = 1 mm on screen**. - The user can hold an object or ruler to compare actual size. ### Additional context _No response_

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Due Date

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Reference: github/OrcaSlicer#1915