Three problems decide whether a part looks professional or hobbyist: overhangs, bridges, and stringing. What many makers miss is that each of these behaves differently depending on which filament you run. This guide gives filament-specific settings that get clean geometry out of PLA+, PETG, ABS and TPU.
Why Filament Choice Changes Everything
Temperature, cooling needs, and melt viscosity are unique to each material. A retraction value that is perfect for PLA may leave PETG with a beard of strings and collapse every bridge on TPU. Understanding the mechanics lets you set the slicer once and trust it.
Filament-by-Filament Settings Table
| Filament | Nozzle Temp | Cooling | Retraction (direct drive) | Stringing Risk |
|---|---|---|---|---|
| PLA+ | 200–215°C | 100% | 0.5–1.0 mm | Low |
| PETG | 240–250°C | 30–50% | 1.0–1.5 mm | Medium |
| ABS | 240–255°C | 0–30% | 1.0–1.5 mm | Low-Medium |
| TPU | 225–245°C | 50–75% | 1.5–3.0 mm | High |
Overhangs: When the Layer Needs Something to Hold On To
An overhang works until the layer above has no surface below it to adhere to. Pushing past about 45° without supports invites droop. Filament stiffness matters: PLA manages shallow overhangs beautifully, while softer TPU sags earlier and benefits from lower speed and more supports.
Overhang tips
- Use adaptive layer height to keep fine detail on steep areas.
- Cool PLA aggressively; keep the part cooler with PLA being happy at 100% fan.
- For PETG, moderate cooling — too much cold causes it to lift from supports.
Bridges: Pure Speed and Cooling
A bridge is a horizontal span printed between two anchor points. Success comes from extruding thin, moving fast, and cooling hard so the plastic solidifies before it sags. PLA is the champion bridger. PETG and ABS need gentler speeds with less cooling; TPU bridges poorly and should be avoided for unsupported gaps.
Bridge settings
- Lower bridge fan speed for PETG/ABS to avoid cracking.
- Reduce bridge flow by 10–15% to keep the strand thin and taut.
- Increase bridge speed relative to wall speed for a clean pull.
Stringing: Retraction Is the Whole Game
Stringing is molten filament dragged between features when the nozzle travels. The cure is retraction, but each material wants a different dose. PETG is string-prone and needs slower, slightly longer retraction with lower temp. TPU is the worst — it absorbs retraction length due to elasticity, so increase retract distance and slow travel moves.
Start With the Right Spool
Consistent spool winding removes a whole class of jams and tangles before they start. ANTINSKY PLA+ Filament is a dependable daily driver; PETG handles durability needs; ABS suits heat and chemical resistance; and TPU delivers flexibility. Each is stocked at InnoStation 3D.
Tags: FDM, overhangs, bridges, stringing, PLA, PETG, ABS, TPU