Designing and Printing Pro PCTG Parts for Strength – 3D-Fuel

Orientation: parts are strongest when loads run along the layer lines.
Walls and infill: about 4 walls and 30–60% infill for functional parts.
Cooling and speed: less fan and slower printing give stronger layer bonds. See Weak or brittle parts.
Temperature: hotter printing within 250–280°C improves bonding.
Failure mode: Pro PCTG tends to break rather than shatter into sharp shards like PETG.
Fiber-filled versions are stiffer, not tougher.
Annealing isn't recommended. Pro PCTG is primarily amorphous, so annealing doesn't meaningfully raise heat resistance and is likely to distort parts.
Heat-set inserts work well in Pro PCTG.
Gluing: epoxy is strongest. See our adhesive test.