The manufacturer’s claim is that PLA Tough+ withstands repeated flexing and is recommended for springs, compliant mechanisms, box latches, and other such parts
Is anyone aware of publically available test results, or can they are share their experiences with this filament?
From minute 7:45 - But note that in the videos, this is not called “flexing”, but “stiffness”.
…or if that’s too long as a short:
Thanks but wrong filament and wrong question. PLA Tough is discontinued. Question was PLA Tough+. Also question was repeated flexing , not maximum strength needed to break.
(EDIT for clarity: Not how hard can I pull before it breaks, but how many times can I pull it?)
Well, the layer bonding is certainly impressive… don’t use it for support interface! It’s a very stiff material, so saying it flexes well sounds a bit funny, but sure, seems it would be quite hard to break vs even ASA or PC, for example (which is completely anecdotal since I have zero data to back that up). Clearly way stronger than PETG or regular PLA, even w/out scientific tests. Seems mostly thanks to the adhesion. For something like a spring or flexible latch…? I don’t know… I think it would need to be thinner to have the same springiness as a more flexible material, so that may or may not negate its strength/bonding advantages… probably depends on the part. It should make a good stiff spring, for sure. 
I do like it for smaller tough working pieces like hinges or fasteners. I can make fine threaded parts with it that match standard thread patterns and it grips “real” metal fasteners great, very sturdy. And it is easy to print, w/out high temps like “engineering” materials. But I find I have to adjust tolerances pretty specifically for this material, eg. threads or pins that are smooth in PETG or ASA are going to be too tight in T+. But that’s also partially because it just has less give/flex. It also warps pretty easily for larger/flat parts, so that can be a challenge.
-Max
The video answers the question. If something is less stiff, you can flex it more often. Since you replied so quickly, faster than the video is long, you probably missed it. 
You just have to get away from the term “flexing” in your mind and replace it with “stiffness”. Less stiffness, more flex. However, it will not give you an answer to “How often,” but rather as shown in the chart:
2140 Mpa (Tough+) to 2750 Mpa (PLA) 
You probably want to see someone bending it back and forth? Maybe this video is more your thing: - However, it will be hard to find a test where someone simply bends it back and forth. Most tests are performed like the one in the first video I posted.
Just for your information: Often only the name changes. The first video I posted refers to: Modified PLAs known under the name PLA+, Tough PLA or Impact PLA claim to tackle some of those downsides.
I do not think it does.
Also out of the filament data you posted, the Bending Strength is close to what is being asked, but is not quite the same thing. Although I would be happy with an extended test of the bending strength - take it to the limit several hundred times, and then compare the current performance to the original.
Likely, a more practical/likely to be done test would be "i printed suspension for my RC car and it breaks after X hours driving with PLA and Y hours with PLA tough+” for example.
@MaxThreeD Thanks this is useful to know. I did not expect the tolerance to be that different.
Believe me, I really understand what you want to see. You want to see someone print a spring using different materials and compare them. However, as I said, you’re not likely to find that, because most people use standardised tests so that the results are understandable to everyone.
You want to get an answer from a test such as this: ‘It can be bent 10 times more often than normal PLA.’
But why don’t people do such tests and just talk about stiffness? Because it’s easier to compare. A small rectangular printout is easier to compare than a complex spring, which people might print in different dimensions and with different infills.
Above all, despite all the advertising, at the end of the day you have to say: No PLA or PLA tough+, no matter what it’s called, is really suitable as a spring - and suspension is also “questionable”. Despite all the advertising. In the case of the RC car, for example, it would not be suitable, as it could be exposed to moisture, dirt, sunlight and, depending on the design, oil and petrol. This may be feasible for a display model, but not for a drivable one. You need ABS or nylon is great for springs and maybe the suspension system that need to withstand impact.
I mean, are you specifically looking for something for RC cars? In that case, the question would be: What type of filament should I use for my RC car spring or suspension system?
Perhaps it makes sense to ask at this point: What do you actually want to print?
@RetroSharky For your information, PLA leaf springs work OK in small RCs where you are trying to keep hardware to a minimum.
I have a number of things I could print, if only I knew how the filament would perform.
As far as RC cars and filament are concerned, you might have better luck asking there. They’re quite active on this topic.
https://www.rctech.net/forum/3d-printing-forum-194/
Of course, there are other rc forums, just one example.
Edit: I’ve just read a few topics myself - they’re pretty interesting! You’ll find lots of experience reports and answers your questions regarding the filament.
For a suspension spring the amount of flex is kinda important, so before you could even answer the question of which is more durable, you’d need to match the flexibility (as in bounce or “springiness”) factor of two parts printed from different materials. As 'Sharky said, that’s some pretty specific testing. But it would definitely be interesting! It’s a fairly unique material… worth an investment in a spool to check out, I think, and if not springs it should do really well on high-stress parts like linkage or structure (compared to regular PLA or PETG).
As another feature, it bonds rather well to PETG, unlike other PLA. I’ve mixed it with BL PETG HF and Translucent. Did I mention its adhesion? The stuff really sticks.
-Max
I’ll leave the PDF here, which tests Bambu performs themselves, but they also give the results in MPa and not in “how often”. I just stumbled across it because of another topic. 
For information the term “bending modulus” is also referred to as:
Since they adhere to ISO standards, the values are certainly accurate.
This isn’t exactly what you want, but I have done a small amount of informal testing of PLA Tough+ with this spring:
I use a good number of these filament clips that are essentially springs. PLA Tough+ creeps under load, like regular PLA. If I compress the clip and stick it on my filament spool, it will be much less springy within a day or two. PETG handles this tension much better. It might be okay if the spring is not normally loaded. But I would not expect it to hold energy for any length of time.
Thanks that is helpful. I did not expect it to creep so much.
My Tech Fun does their normal filament evaluation of Bambu PLA Tough+ in this video, which skips to the part that covers creep:
It is very similar to Bambu PLA Basic, which is not good. I think you want springs that will store energy and then return it. I don’t think any kind of PLA does that very well due to creep. My experience is that PETG will also creep a bit. But it tends to be limited. I have good luck with my filament clips using PETG. They do lose some of their springiness over time. But they are still very usable.
