- Flex TPU Filament - 85A Shore, ISO 10993, High Flexibility & Toughness, High Flow & Speed, Easy to Print, Moisture-Resistant Aluminum Bag - Ideal for Footwear, Protective Gear (Black, 1kg)

I bought this to try making custom hard case inserts, similar to another reviewer. I was largely unsuccessful getting this to print at 270C on my 0.4mm nozzle (it immediately clogged), but after switching to 0.6mm I have had no issues at all. At the 270C settings, this material really can't do overhangs, but after doing some testing I found that it works fine at 15% infill with 4+ top layers. At lower infills or fewer top layers, the infill texture shows through and there can be gaps in the top layer. Because of the foaming aspect, prints seem to use less filament than if printed in regular TPU. The texture of the finished product is similar to EVA foam and looks very clean after cleaning up some errant strings. It is perfect for my use case, and it's so nice being able to print an exact fitting insert! In the past I used sheets of packing foam, and it always was a pain trying to cut an exact fit while maintaining a clean look. Since the surface comes out relatively smooth it's also easy to wipe clean. TLDR; this stuff is great!

This is some genuinely great stuff. It took a bit to dial in the settings but after that it prints great. I recommend looking at the user guide for this on the Siraya Tech website. At max expansion, it’s less than half the density of regular TPU and really is fairly soft and super squishy. It also has a cool foam texture that hides layer lines. Doesn’t string at all and has great layer (and bed) adhesion. In fact, the bed adhesion is so good it peeled some of the PEI coating off 😅. It’s defintely weaker and less tear resistant at max expansion but it’s still super strong. The main problem is the fact it oozes constantly, which is due to it expanding. It’s honestly not much of a problem but it does effect the surface quality across gaps. Also, like every other TPU, it can’t do overhangs well bc the filament droops down.

This took a little time to get the settings dialed in perfect (BambuLab X1c). This does not print like 95a tpu. It wants to ooze out the print noozle, with existing flow settings. So, I had to turn my flow way down. Just follow Siraya tech's print recommendations and you will get to a great starting point. I love how if you print this at 240c it is more dense (heavier), and if you print at 270c it is more squishy (lighter). It has a texture a lot like filaments that have carbon or glass fiber in them. This gives it a great texture. I've printed squishy balls, croc shoes, and flying discs. All have been a blast to print. All I want more out of this product, is more colors to choose from!! I will buy more when that is the case.

I’ve been printing with Siraya Tech Flex TPU (85A Shore) and overall, it’s a solid choice for flexible parts. The filament delivers excellent elasticity and toughness—perfect for footwear prototypes, protective gear, and other functional prints. It flows well at higher speeds compared to many TPU brands, and the moisture-resistant packaging is a nice touch for storage. Print quality is great once you dial in the settings. Layer adhesion is strong, and the finished parts feel durable and smooth. However, TPU can be tricky, and this filament is no exception—you’ll need to fine-tune retraction and speed to avoid stringing. It’s not quite “plug and play,” but that’s expected for flexible materials. The ISO 10993 compliance is a big plus for projects requiring biocompatibility. Overall, this is a high-quality TPU filament that performs well if you’re willing to spend a little time on setup.

This stuff is awesome. Print things that need to take some abuse. Layer adhesion is nuts. Feeds through PTFE just like any other filament. Very little stringing. Glossy. Has trouble bridging like every other TPU, and it needs to be printed slowly. On my Qidi Q2 it looked best at 245C, and with 0.4mm nozzle I'm getting around 6mm3/s max volumetric, 60mm/s max speed, and using 30mm/s on outer layers. I will be buying a lot more of this.

This Siraya Flex TPU Air white is basically like printing EVA foam. Amazing stuff for wearables, its strong and lightweight, and retains its shape even after extreme elongation... IMO it blows the OVERTURE and eSUN TPUs out of the water. Speed 30-50mm/s, set temp and flow ratio using the chart, set PEI bed to 40C, add a relase agent like elmers purple stick glue to the bed, and you'll be printing in no time. I use a 0.8 mm nozzle with 0.45mm layers on a Voron 2.4

I love this stuff. It works great and creates a neat foamy texture. I use it to make vibration dampers for motorcycle parts and knee pads! They offer print profiles, none for the printers I have, but its easy enough to peep the json and set the baseline for your printer assuming you use orca slicer. It will string no matter what, dont even bother with retraction. The filament foams so its going to spill out of the nozzle, you can see in the pictures. Just plan on some post processing. I will also say that the adhesion is very very strong. Much more than the regular tpu I have used. I ruined a smooth carbon-fiber look build plate with it. Printing over packing tape might be a good idea. I tried glue but that didnt help the bed ruining conditions. Depending on your printer it might also help to have a bearing roller for the spool. its very soft. Technically not supposed to go this low of durometer with my Kobra S1, but it works fine.

Mimics foam rubber better than anything else I've used! Printing on a K1max with a top mounted spool holder and feeding directly to the extruder without using any guide hose it completes prints with minimal difficulty. Moisture control is extremely important but once you have the settings right and dry it out you'll be shocked at what it can do. It's also unbelievably durable! I sent it into a steel beam at about 350 feet per second velocity and it was completely unaffected. No tearing, no layer separation, aside from the rust it scuffed off the steel you couldn't tell! 270° print temp and 15% infill feels like pourable expanding rubber foam. This has a million uses.