3D-Printed Silicone Bellows Covered with PLA Layers for Sealing Functions
In the realm of FDM filaments, flexible variants such as TPU open up new possibilities for design and application. This is evident in the TPU-based bellows recently demonstrated by the Functional Part Friday channel on YouTube.
The process is relatively straightforward: alternating layers of TPU and PLA are printed, with the TPU connecting to its previous layer in an alternating fashion. Once printed, the PLA layers are peeled away and the resulting bellows are ready for use.
However, the journey was not without challenges. For instance, variations in TPU quality from different brands (such as Sainsmart and Sunlu) caused some complications. Compatibility issues between the Bambu Lab AMS and TPU further complicated matters, leading to brittle TPU prints. This necessitated bypassing the feed mechanism in the AMS, which in turn led to preventing the PTFE tube from getting drawn into the AMS. Printing TPU and PLA simultaneously requires a printer with two independent extruders, like the Bambu Lab H2D used in this demonstration. This development is beneficial for owners of the H2D and IDEX printers.
Practical applications for these bellows extend beyond reproducing 1900s-era camera parts or accordions. They can also be used to create lathe way covers and other related items.
When it comes to printing TPU-based bellows with PLA supports, considerations include material selection and compatibility, printer requirements, printing tips, specific brand considerations, and troubleshooting common issues. For instance, TPU, known for its elasticity and durability, may require temperature settings of around 200°C to 220°C. PLA, used for its rigidity and ease of printing, is typically printed at 190°C to 220°C. Dual extrusion is ideal for this application, as it allows for simultaneous printing of TPU and PLA.
By understanding these guidelines and adjusting settings based on the specific printer and filament brands, the success rate of printing TPU-based bellows with PLA supports can be improved.
The exploration of TPU-based gadgets, such as the demonstration of bellows, showcases the potential of FDM filament technology in expanding design possibilities. To successfully print TPU-based bellows with PLA supports, one must consider factors like material selection, printer requirements, and troubleshooting common issues, ensuring optimal temperature settings for both TPU and PLA for dual extrusion.
