January 14, 2026
Description
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.
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.
Youll 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.
| Parameter | Suggested values |
|---|---|
| Flow | 150 200 % |
| Speed | 10 15 mm/s |
| Fan | 100 % |
| Layer height | 0.2 mm |
| Material | PLA (recommended) |
| Nozzle | 0.40.6 mm |
These values are what worked best for me on a FlashForge AD5X with a 0.6 mm nozzle.
Most slicers are tuned for printing on solid layers, but bridges behave differently theres nothing underneath, so the filament doesnt get squished or widen as usual.
Thats 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.
You can download both STLs and print them separately.
For faster comparisons, print at 1 wall / 10 % infill.
Share your results Id 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
License:
CC0
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