3D Printing Bridge Calibration Test (Basic & Advanced)
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Two test models to calibrate bridge flow and speed in your slicer. Use them to find the perfect settings for unsupported
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Model information
- Source
- Printables
- Category
- Test Models
- License
- Creative Commons — Public Domain
🎥 Watch the video tutorial
In the video, I explain:
-How bridge flow and speed affect the print.
-Why more flow gives smoother results.
-How to tune these settings in OrcaSlicer.
-How to combine this with Tree Supports → “Critical regions only” to skip supports in bridges automatically.
🧩 About this model
This is a bridge calibration test designed to help you fine-tune the flow, speed, and cooling parameters of your 3D printer for perfect bridges — no supports needed.
You’ll find two STL files included:
BRIDGE CALIBRATION.stl → Simple version for short bridges (perfect for initial tests).
ADVANCED BRIDGE CALIBRATION.stl → To push your settings further.
Both files let you test different Bridge Flow Ratios (1.0 / 1.5 / 2.0) and Bridge Speeds (25 / 15 / 10 mm/s).
You can print them one after another and easily see which combination gives the best results on your printer.
🔧 Recommended settings
| Parameter | Suggested values |
|---|---|
| Flow | 150 – 200 % |
| Speed | 10 – 15 mm/s |
| Fan | 100 % |
| Layer height | 0.2 mm |
| Material | PLA (recommended) |
| Nozzle | 0.4–0.6 mm |
These values are what worked best for me on a FlashForge AD5X with a 0.6 mm nozzle.
🧠 Why this test matters
Most slicers are tuned for printing on solid layers, but bridges behave differently — there’s nothing underneath, so the filament doesn’t get squished or widen as usual.
That’s why increasing the bridge flow often gives better results: wider lines that touch each other and stay straight in the air.
Combining that with lower speed and maximum cooling produces clean, smooth bridges without sagging.
💡 Notes
You can download both STLs and print them separately.
For faster comparisons, print at 1 wall / 10 % infill.
Share your results — I’d love to see how your bridges turn out!
🌐 More resources
📘 Complete Fusion 360 Course (in Spanish):
👉 https://knincustom.com/pages/cursos
📺 Find us on YouTube:
👉 https://www.youtube.com/@KNIN_Custom