3D Printing Bridge Calibration Test (Basic & Advanced)

🎥 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 ParameterSuggested values Flow150 – 200 % Speed10 – 15 mm/s Fan100 % Layer height0.2 mm MaterialPLA (recommended) Nozzle0.4–0.6 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