How to Print Flexible Filament: Tips and Tricks for Success

Flexible filament, also known as TPU (thermoplastic polyurethane), is a popular material for 3D printing due to its unique properties. It is soft, flexible, and durable, making it ideal for creating objects such as phone cases, toys, and even shoes. However, printing with flexible filament can be challenging, and many users struggle to achieve good results. In this article, we will provide you with some tips and tricks for printing with flexible filament, so you can achieve high-quality prints every time.

1. Choose the Right Printer

Not all 3D printers are capable of printing with flexible filament. Before you start, make sure your printer is compatible with TPU. Look for a printer with a direct drive extruder, which is better suited for flexible filament than a Bowden extruder. A direct drive extruder has the motor located directly above the hot end, which allows for better control and precision when printing with flexible filament.

2. Adjust Your Printer Settings

Printing with flexible filament requires different settings than printing with traditional filaments like PLA or ABS. Here are some settings to adjust:

• Print speed: Slow down your print speed to around 20-30 mm/s. This will give the filament time to properly extrude and adhere to the bed.
• Retraction: Retraction can cause issues with flexible filament, so it's best to turn it off completely.
• Temperature: TPU requires a lower printing temperature than other filaments. Start with a temperature of around 220-230°C and adjust as needed.
• Bed temperature: TPU doesn't require a heated bed, but if you're having trouble with adhesion, you can try setting the bed temperature to around 50°C.

1. Use the Right Bed Surface

Flexible filament can be tricky to get to stick to the bed. Using the right bed surface can make all the difference. A PEI sheet or a BuildTak surface are both good options for printing with TPU. You can also try using a glue stick or hairspray to help the filament adhere to the bed.

4. Print with Support

Printing with support can help prevent the filament from curling or warping. However, traditional support structures can be difficult to remove from flexible filament. Instead, try using a water-soluble support material like PVA. This will dissolve in water, leaving your print intact.

5. Experiment with Different Brands

Not all TPU filaments are created equal. Different brands can have different properties and require different settings. Don't be afraid to experiment with different brands to find the one that works best for you.

In conclusion, printing with flexible filament can be challenging, but with the right printer, settings, bed surface, support, and filament, you can achieve high-quality prints. Remember to take your time and be patient, and don't be afraid to experiment. Happy printing!