Siraya Tech 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 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.

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.

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!

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 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 truly love this TPU. It is almost indestructible and very easy to print -- including from a Bambu AMS. When I need durability, Siraya Tech TPU64 is the first filament I consider. It is quite a bit stiffer than the more common TPU 95A varieties, and the stiffness can be tuned with wall and infill settings. With 1 wall and 5% gyroid infill, it has good flex and is still quite durable. With 5 walls and 50%+ infill, it can be used in many cases where a "rigid" filament is needed, and is almost unbreakable. Multimaterial possibilities for TPU64 are amazing, too: add durability and impact resistance to almost anything.

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.

The material feels like shoe foam A bit do to lightness. The heat gun helped remove minor stringing. Supports should be printed in a separate material if possible because of the insane level of layers adhesion. Easier to print then TPU so far at 240c and flow rate 70mm3 on a p1s generic tpu settings for everything else. The shoes feel better than the TPU ones I tried currently testing durability, but sock only do to me not being able to remove the supports entirely(I don’t have an H2D or other multi tool head printer and don’t try the AMS. Material just feels right after printing Hope the review was helpful