3D printing with flexible filament can be fun and rewarding when done correctly. In this guide, you will learn how to successfully print Siraya Tech TPU 85A filament using Bambu Lab X1 and P1 series printers.
This article is written for beginners and experienced users alike. Every step is explained clearly so you can achieve smooth, flexible, and strong prints without confusion or wasted filament.
Why Choose Siraya Tech TPU 85A Filament?
Siraya Tech TPU 85A is well known for being flexible, durable, and easier to print than many other TPU filaments. It bends easily while still keeping its shape, making it perfect for parts that need to stretch or absorb impact.
This filament is commonly used for phone cases, protective covers, gaskets, seals, grips, and wearable items. It also has a higher flow rate than most TPU 85A filaments, which allows faster printing while maintaining flexibility and surface quality.
Bambu Lab Printer Compatibility
This guide focuses on the Bambu Lab X1 and P1 printer families. These printers share a similar direct drive extrusion design, which means the same TPU setup and settings can be used across all supported models.
Compatible printers include:
- Bambu Lab X1
- Bambu Lab X1 Carbon
- Bambu Lab P1P
- Bambu Lab P1S
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📌 Not sure which filament fits your Bambu printer best? Don’t forget to check out Best Filament for Bambu A1: Top Picks for Quality and Performance to compare your options.
Printing TPU on Bambu Lab vs Other Printers
Printing TPU on Bambu Lab printers is usually more stable than on many other brands. The controlled filament path and consistent extrusion help reduce common TPU issues such as tangling and under extrusion.
However, TPU is much softer than PLA or PETG. This means filament feeding must be handled carefully. Paying close attention to the feeding process will greatly improve print success and reduce failed prints.
📌 Different filaments work better on different printers. Browse Bambu Lab Filament Guide: Materials, Settings, and Tips to see what works best.
TPU Filament Feeding Process (Very Important)
TPU bends easily, so it cannot be fed the same way as stiff filaments. Using the correct feeding method is one of the most important steps in TPU printing.
The method below is a commonly used user technique that helps improve TPU feeding reliability on Bambu Lab printers.
Step by Step Feeding Instructions
Step 1: Open the top cover
Open the printer’s top cover so you can clearly see the extruder and filament path. This makes feeding easier and more accurate.
Step 2: Remove one end of the PTFE tube
Gently remove the PTFE tube from the extruder side only. Do not remove it from the back of the printer. This allows the TPU filament to enter the extruder in a straighter path with less resistance.
Hold the loose PTFE tube with one hand to help guide the filament. This helps prevent the TPU from bending or getting caught during feeding.
Here is a picture:
Step 3: Feed the filament directly into the extruder
Slowly insert the TPU filament into the extruder. Make sure it moves smoothly and does not curl or buckle. Once it feeds cleanly, you are ready to start printing.
Keeping TPU Filament Dry
TPU filament absorbs moisture from the air very quickly. Moist filament can cause popping sounds, rough surfaces, weak layers, and stringing.
Proper Storage
Always store Siraya Tech TPU 85A in its original moisture resistant aluminum bag when not in use. For long term storage, use a sealed dry box with desiccant and keep humidity ideally below 15 to 20 percent.
Drying Wet Filament
If you suspect moisture, dry the filament at a temperature between 50°C and 65°C. Drying should take 4 to 6 hours using a filament dryer or a carefully monitored oven.
During Printing
For long prints, feed the TPU directly from a dry box. Place the dry box at a similar height to the printer to reduce tension. This helps the filament feed smoothly and consistently.
Recommended Printing Settings for Siraya Tech TPU 85A
Using the correct settings is essential for flexible filament. Bambu Studio includes a Generic TPU profile that is widely used and proven by users to provide stable and high quality results.
Key Settings to Follow
Nozzle Temperature
A nozzle temperature around 220°C provides good layer bonding and smooth extrusion. Small adjustments may be needed depending on the printer model and environment.
Print Speed
TPU prints best at slower speeds. The Generic TPU profile already uses safe speed values. You can run a maximum flow rate test if you want to fine tune performance.
Retraction Settings
Because TPU stretches easily, retraction must be gentle. The default retraction settings in the Generic TPU profile help reduce stringing without causing jams.
📌 Settings can change based on your printer model. Discover Best Filament for Bambu Lab X1 Carbon: Expert Recommendations for more helpful tips.
Conclusion
Printing Siraya Tech TPU 85A on Bambu Lab X1 and P1 series printers can be simple and enjoyable when done correctly. Proper filament feeding, moisture control, and the right printer profile make a big difference.
By following this guide, you can create flexible, strong, and high quality TPU prints with confidence. Take your time, be patient, and enjoy exploring what flexible filament can do.
📌 The right filament makes printing much easier. Check out Best Filament for Bambu Lab P1S and P1P: A Complete Guide to find the best choices.
Frequently Asked Questions
Can Bambu Lab printers use TPU?
Yes, Bambu Lab printers can print TPU very well. Their extruder design supports flexible materials when fed correctly. Proper setup is the key to success.
Can I use TPU in my Bambu AMS?
No, TPU is not recommended for use in the Bambu AMS. TPU is too soft and can bend or jam inside the AMS feeding system. It should be fed externally instead.
What filaments can the Bambu P1S use?
The Bambu P1S supports PLA, PETG, ABS, ASA, TPU, and other common filaments. Some materials may require enclosure and temperature adjustments. Always check filament requirements before printing.
Does Bambu Labs sell TPU?
Bambu Lab does not currently offer TPU filament in their official lineup. However, many third party TPU brands work well with Bambu printers. Siraya Tech TPU 85A is a popular and reliable choice.
Can I print TPU with a 0.4 nozzle?
Yes, TPU prints well with a 0.4 mm nozzle. This nozzle size offers a good balance between detail and flow. Most users achieve excellent results with it.
4 comments
Amir
This is really helpful. Thaks. I tried to push through ptfe tube. But it did not work. So filament directly to nuzzle as instructed work. However, before actual print starts, you need to pull filament upwards so that it won’t entangle in middle of preparation. After this, as the movement of nuzzle become repetitive and predictable, you can monitor and leave it.
Rick Vogel
You say to use the Bambu lab generic TPU profile, but the temperature is 240 in that profile, not 220!
Paul Poindexter
We went ahead and ordered a spool to add to the testing. So far our test includes Bambu 95A TPU, Fiberlogy Fiberflex40D, Overture HS TPU, Ninjatek Ninjaflex85A and Cheetah95A and now the Sirayaflex85A.
Initial testing of the 95A’s proved to be a little too stiff for the application.
Prior to getting the Sirayaflex, The Ninjaflex was hands down the most flexible material tested but prints very slow. On the BambuX1C we reached 4.75mm/3 with a .8mm hot end @ .24mmLH.
The Sirayaflex tested very well to our surprise and is now our favorite. It prints very well with almost zero stringing and at amazing speeds compared. It’s not quite as springy/flexable as the Ninjaflex but extremely close. I would say their TDS data was spot on comparing the two. 580 vs 660 on the ninja @elongation at break.
We were able to achieve 15.5mm/3 with a .8mm hot end producing speeds up to 85mm/s with the .8mm tip @ .24mmLH.
There is nothing on the market that we have tested with that comes close to this in the 85A equivalent. Very pleased!
Paul Poindexter
If you tested with the Bambu, Why not say what speeds you were able to achieve?
I am a manufacturer and we are currently testing 7-8 different brands of TPU for a new product. Giving better start parameters is highly beneficial when it comes to TPU as they all can be really different between what each one runs at on the same machine. We run the Bambu X1’s.