How to Fix Stringy and Messy TPU 3D Prints

Question: Why is my TPU 3D print stringy and messy?

Answer: TPU is a flexible filament that requires specific settings to avoid stringing and messy prints. First, lower your printing temperature in 5°C increments, starting around 210°C, to reduce oozing. Too high a temperature causes the filament to drip and string. Next, increase your retraction distance and speed—try increasing retraction by 1-2mm and speed to around 30-40mm/s. TPU is tricky with retraction, so experiment to find the sweet spot without clogging. Also, enable combing mode if your slicer supports it; this keeps the nozzle within already printed areas, reducing travel moves that cause stringing. Print slower overall, around 20-30mm/s, to improve control. Finally, dry your filament before printing, as moisture can cause bubbles and stringiness. Store TPU in a dry, sealed container with desiccant. Following these steps should significantly reduce stringing and produce cleaner TPU prints.