Design Guides
Design Parts That
Print Perfectly
Everything your customers need to know about designing for 3D printing. File formats, wall thickness, overhangs, tolerances, and material-specific recommendations.
File Formats
Recommended File Types
STL
Industry standard
Triangle mesh format supported by all slicers. Export at high resolution: chordal tolerance ≤0.01mm, angular tolerance ≤1° for smooth curves. Binary STL preferred over ASCII for smaller file size.
3MF
Modern alternative
XML-based format that preserves model hierarchy, materials, colors, and metadata. Smaller than STL. Supported by PrusaSlicer, Cura, and Bambu Studio. Recommended for multi-material designs.
STEP / IGES
Engineering CAD
Parametric formats for engineering parts. Preserves exact geometry without tessellation. Convert to STL with fine settings for printing. Preferred for mechanical assemblies.
Design Rules
DFM for FDM 3D Printing
| Design Element | Recommendation | Notes |
|---|---|---|
| Minimum Wall Thickness | ≥0.8mm (0.4mm nozzle) | 2× nozzle diameter minimum. For structural parts, use ≥1.2mm. |
| Unsupported Overhangs | ≤45° from vertical | Beyond 45° requires supports. 60°+ strongly needs supports. |
| Bridging | ≤50mm span | Longer bridges may sag. Active cooling fan essential. Test with bridging calibration print. |
| Hole Diameter (Horizontal) | Drill after printing for precision | FDM holes print ~0.1-0.2mm undersized. Design 0.2mm oversize or post-drill. |
| Clearance (Moving Parts) | 0.3-0.5mm gap | For print-in-place mechanisms. Depends on printer calibration and material shrinkage. |
| First Layer | 0.2mm height, 105-110% extrusion | Slower speed (20-30mm/s) for adhesion. Clean bed essential. |
| Corner Fillets | R ≥2mm recommended | Sharp corners concentrate stress. Fillets improve strength and printability. |
| Embossed/Engraved Text | ≥4mm height, ≥0.5mm depth | Top-surface text prints clearest. Avoid text on vertical walls. |
Parameters
Material-Specific Recommendations
PLA / PLA+
Nozzle: 200-220°C | Bed: 50-60°C
Speed: 60-80mm/s | Cooling: 100% fan
No enclosure needed. Best for decorative parts, prototypes, and consumer products. Low warping, easy to print.
PETG
Nozzle: 230-250°C | Bed: 70-85°C
Speed: 40-60mm/s | Cooling: 30-50% fan
Partial enclosure recommended. Stronger than PLA, more flexible. Good chemical resistance. Slight stringing — tune retraction.
ABS / ASA
Nozzle: 240-260°C | Bed: 100-110°C
Speed: 40-60mm/s | Cooling: 0-20% fan
Full enclosure required. Warp-prone — use brim or enclosure preheat. ASA for UV-resistant outdoor parts. Ventilate for fumes.
TPU (Flexible)
Nozzle: 220-240°C | Bed: 40-60°C
Speed: 20-30mm/s | Cooling: 50% fan
Direct drive extruder required. Disable retraction or use minimal (1-2mm). Dry filament before printing. Shore hardness 95A recommended for beginners.
Nylon (PA)
Nozzle: 250-270°C | Bed: 80-100°C
Speed: 30-50mm/s | Cooling: 0-30% fan
Enclosure required. Must be dried (70°C for 6-12h). Use glue stick or garolite bed surface. Strong, durable, but hygroscopic.
Polycarbonate (PC)
Nozzle: 270-300°C | Bed: 100-110°C
Speed: 30-40mm/s | Cooling: 0-20% fan
Full enclosure at 50°C+ required. All-metal hotend mandatory. Extreme strength and heat resistance. Must be thoroughly dried.
Common Mistakes
Design Errors to Avoid
❌ Paper-Thin Walls
Walls thinner than nozzle diameter cannot print. Always design at 2× nozzle width minimum.
❌ Unsupported 90° Overhangs
Horizontal surfaces in mid-air will fail. Add chamfers, split the part, or accept support material.
❌ Ignoring Layer Adhesion
Z-axis is the weakest direction. Orient parts so load is across layers, not along them.
❌ Skipping Filament Drying
Wet filament causes stringing, popping, and weak prints. Nylon, PETG, PC especially hygroscopic.