Hi Igor! I was very excited waiting for this video - I never saw a Filament Wearing test on RU-vid before... So, this was VERY NICE! Congrats my friend!
@@MyTechFun Oh, that's cool! It is nice that you can line-up your 3D Printing activity here to what you to academically. By the way, I sent you an email.
Critique: The wobble of the pin, presents a sharp edge that cuts the sample, rather than friction. Perhaps chamfer the edge of the pin, to make sure only friction is measured.
I agree, but the wobble of pin is presented only with that 0.3mm shaft which I made from bolt. The 6mm was a real accurate shaft. But even then I believe that results are usable.
@@ManjaroBlack it will keep rotating unless everything is dead-dead square. or till there is more friction that keeps it from rotating than there is of it moving down as it wears the samples.
I have to agree this is testing a cutting edge more than surface to surface friction. The test still provides invaluable data and the use cases are adjacent concerns in many applications, thank you for releasing this video! I would be extremely interested if you get a chance to repeat the test with a slightly rounded bolt, especially on those later samples just to see if the lack of sharp edge makes a significant difference
Wow! This investigation was brilliant! I loved the custom apparatus, really shows how much effort goes into this videos. Really rigorous and precise yet easy to understand methodology, and free results for everyone! The 3D Printing community is very thankful for your work!
Thank you for testing TPU. There are a lot of RC car skid made from PLA. I've only seen one person make from TPU saying it is self lubricating and thus is ideal for abrasive applications. So happy to finally see it proven to hopefully distrust that niche market.
me too! very surprising result for that part, i expected nylon to do well but not for TPU to do so friking well, now i have to decide if i go for nylon over TPU for my gears
Awesome video! Back in the days I had to print a part that was used sliding in a channel and after few tested I used PETG, also tried Nylon as you. TPU seems a great choice too. Keep the good work. +1 subscriber.
Thank you for sharing your valuable experiment results. Most of the experimental results were as expected, but I was surprised that TPU has such good abrasion resistance.
This was very interesting especially with the TPU. I’m glad you are going to test it with some filament made for high wear resistance like the IGUS ones. I believe IGUS adds small bits of a solid lubricant into their filament. Another type of wear resistant filament you could try is from the company “Spectrum” (they are a European company too and advertise sending filament to people who have a good project) they make a PC-PTFE blend and a PETG-PTFE blend, the PC-PTFE claims a similar wear resistance to the IGUS stuff. They also make other very interesting filament. From what I have seen the IGUS filament is difficult to print, I have only used the Spectrum ones but they weren’t that bad to print but I do need to calibrate them further, they were very difficult to sand down to the final size though, so they definitely seem to be wear resistant.
Thank you for doing this. Very interesting and informative. Ninjaflex advertises a 75D tpu as more wear resistant than nylon. I was skeptical, but I guess it really is the best.
Right on time. I made some shafts made out of PLA and it rotates inside of laser cut acrylic hole. Acrylic on acrylic binds but PLA on acrylic is better, with lubrication even better with load. Eventually used a support bearing. Plastic 3D printed material is not for precision, ok for crude jobs, very hard to find the accurate tolerances for shrinkage and printing.
First of all great video! Helpful data ... couple of ideas: 1) Curious the about the rotational wear as bearing 2) could have an electrical contact that could wear through to see life between aluminum block and hss bit 3) a cheap granite surface plate as a reference surface to measure from might be worthwhile as an investment, with a .0001 indicator 4) a sleeve bearing for that hss pin may help consistency and reduce wobble
Hm, yes, all very nice suggestions. The rotational wearing idea already given by others too with measuring the weight before-after (on analytic scale). Granite surface, yes, I should buy it already (for my metal working hobby too). Thx.
@@MyTechFun I can't tell you how timely your research so it is much apricated :) Another material would be a glass filled material as I suspect it will be a better bearing surface over the carbon fiber. I think the folks you got your nylon from also offer a glass filled and so does polymaker. There are also glass filled abs and asa options.
for the cleaning of your test rig, you could just mount a paintbrush, or 2, on the sides, and have the part pass under the brush to clean it, so you dont have to do it manually.
Very interesting test. I am also curious which filament would be perfect for anti slip pad. I’ve tried with Fiberlogy Mattflex 40D and it is not working as I would like to. Maybe it’s about the matte version and I should try conventional Fiberflex 40D which I also have. Also - looking forward for making more tests like this video and choosing the (almost) perfect research method :)
The second set of tests with the smaller diameter bolt are not measuring the same thing, as the unit goes backward and forward its tilting the bolt creating an angled cutting edge just like when you grind relief angles causing the edge to dig in rather than rub, you need to use a rounded tip to ensure the edge does not dig in but rather rubs across, this allows tests for wear resistance rather than a ability for the material to be cut or gouged out
Funny how it seems to be not only the hardness of the material, but how smooth it is, that affects how much it wears; I was definitely surprised that TPU had the least wear, but I guess it just has a very low friction coefficient ¯\_(ツ)_/¯
Can you correlate the wear depth to the material's measured harness? I suspect that the TPU is temporarily deformed by the load and returns to its original form once the load is removed and that is why you do not see any ware on the TPU.
It is likely that the color-additive has a larger impact on the wear-resistance than you would expect. For an accurate test, try using all "white" or "clear" instead of multiple colors.
There is a type of plastic that's on many plastic devices, usually as a full coating, but sometimes only covering a part of a device... that has a very rubbery (almost soft) feel, but is extremely strong and resistant to scratches. I don't know what it's called though. I want to buy some and to see if it comes as a spray or if it has to be injection molded and all that, but I just can't remember what it's called. I know I found it online before, but I don't recall what I used to find it and now that google is shit, it's a lot harder to find just about anything.
I would love to see linear bearings made from 95 hf TPU and lubricated. This seems like a possible good choice that is economical. Lubricated 95 HF Tpu sliding on steel, glass, asa etc. I AM JUST A HOBBY GUY BUT i will be making rails in vairious materials. If you want my results before trying it yourself let me know
You didn’t try the Igus filament? It’s made for this exact purpose, being wear resistant. You could have ordered a free sample pack and the sample would have probably been enough to print test prints.
As mentioned at the end of video, I will try IGUS, they will send me some sample filaments, only not sure if it will be enough for detail testing too (mechanical testing I am doing on this channel). If not probably I will buy few spools.
Not a fan of this method because the rod essentially has a cutting edge... Round off that edge on the rod so you won't be messing up your data by introducing a cutting edge. Or do the math for the 90° cutting edge figure out the friction happening on the edge. Is a cool video though 😌
Great idea, unfortunately you are cutting, not rubbing. The pin should have had a radius, as large as possible, but small enough, it will not dig into material due to tilting forces
Igus make speciality filaments for tribology or wear, but they dont disclose their composition, its probably all hype and toxic, you can make all those with recycled plywood instead and ceramic clay balls
As some others have mentioned, I think the sharp edge may be causing an effect there, and I feel like it would be more representative of "true wear" if that was rounded over. That isn't to say this isn't valuable as is! Another wear test idea would be to press the side of a spinning shaft into the piece for a set amount of time/revolutions. This would be similar to how Project Farm tests the ability of oil to prevent wear.
imagine if all papers have this format! that would be fantastic. Appreciate your work Dr. Gaspar. You are my go-to resource for 3D printed materials properties. I always share your videos and website with my students! Cheers!
An interesting test and results. My only concern, is that with the shaft having sharp edges, it might actually be cutting the material, rather than wearing it. I think that the reduction in diameter sort of proved it, as it seemed to be machining the plastic rather than wearing it. A solution to that maybe to radius and polish the end to a mirror finish and repeat the test.
This is really valuable information, thank you for doing this research and sharing it! I hope your videos will gain more attention, they can really help people choosing the right material for a job and helped me some times in the past! Looking forward to the tests with the Igus-filaments as I have tried using I150 I180 and I190 but don't have the time to test them as scientifically as you do.
Which IGUS you suggest? If I understud correctly, they will send me only few meter samples. So, probably I have to buy some to do more detailed testing..
@@MyTechFun I can't really give a well-founded answer as my testing has been limited but I guess the I150 is the most relevant for most applications. I150 needs some tuning but then prints fine. I190 would be interesting as a comparison as it is much stiffer and marketetd to be better overall. Printing I190 on the Raise 3d Pro 2 has resulted in clogs for me so far, so I can't say too much about it. If you manage printing it, I would be very interested how it performs in comparison to I150.
For next tests. Current measurement for the stepper to get also friction of the material as value. Also if your test pieces have relief holes at the end of 20mm travel, shaft will push all the loose material in the hole and it doesn't gather to the ends of the groove.
Thanks for the video. I gotta get me some high stiffness TPU. It also performs well in other regards: layer adhesion, temperature resistance, impact tolerance.
Suggestion, having fillets in the test specimens would save you hours in total printing time without any impact on the tests themselves, e.g. on the square area of the screws
I haven't seen any of your videos before, it's out for four hours and shows 2.4k views. RU-vid recommended it to me on my home page. Thanks for the video, really valuable angle onto filaments, which I haven't covered anywhere before. Regarding improving your setup, I wonder if adding air pressure to clean away dust during the friction load test and then using a very accurate scale to just collect the weight difference might give you easier comparable results. The more relative weight loss the more wear was experienced. Scales are very cheap nowadays. :) Also there are those tools for measuring hardness of like surfaces, I really wonder how those materials compare with each other if at all.
Good suggestion about using weight, I think. Resolution could be an issue on cheap scales though, to get below 1 milligram you jump up to laboratory balances at ~~$500.
liked and subscribed! well deserved for this absolutely well done test video, just keep at it, your channel will bloom sooner or later, thank you a lot for the testing, now i have to buy some tpu and nylon for my gears, cheers!
Very useful data, thanks. I like the comments on a rotating test piece then weighing it. It will likely prevent the clogging. I have found TPU jacketed cables are the best in the intertidal zone with wear resistance against movement on rock in the waves. So I was expecting TPU to do well, but always nice to see an assumption properly verified.
Thanks for your support. I am planning to do few more similar tests, with rotating wear (loaded horizontal shaft will rotate inside static 3D printed object).
This test was very useful. I need to make some gears for the cable release of my car (EV). Instead of buying a complete mechanism, I thought I could just print the gear that need replacing. I guess PETG-CF is a good choice. Thank you! A good and very useful video!
Fantastic video. I love the scientific approach. I'm a chemist, and I'm interested in formulating an adhesive which provides wear resistance. I think I might start with a design similar to the one you showed here!
Hm. I think you're more testing friction than wear resistance … at least, that would fall in line with carbon fibre doing worse and PETG doing well. I believe your results would also change if the infill direction of your top surface would have a different angle vs. the motion direction or if you used ironing. To compare only wear, you would somehow need to normalize the friction - maybe this would be possible by measuring the current to the stepper motor or the forces taken up by the bearings around the rod?
Awesome testing as always :) you have your phone number in the video, not sure if you are ok with that, just fyi. Btw have you seen that yxpolyer also sells modified PPS filament? Pretty cheap and prints on a low temp for a super plastic, it would be really interesting to see how it performs in your testing, thanks!
It seems to be an OK base line test. But the accuracy seem I little skewed, trying to put up politely as I can. I am glad someone brought this up and good to see a test on wear. Please explore this with more accuracy and a better mechanical way of achieving the wear.
Your tests and showcasing the differences in materials is outstanding! Not just for the mumbers, but for visualising how different materials act under the same constraints. Thank you for this input!!
Great testing! It's surprising that carbon fiber doesn't provide a minimum level of protection if you will, affecting some materials negatively and others positively. I wonder if it has to do with how finely it is chopped or the percentage in the material. You definitely deserve more attention from the algorithm!
Nice work Igor. As a mechanical engineer myself I appreciate your approach to these videos. Two questions: Did you compare or test hardness of theses materials? I have heard some folks say that hardness might correlate to wear resistance. Your results for TPU would argue against that. Also, I wonder if there is an ISO or ASTM standard test method for this property.
Earlier I measured the Shore D hardness of polymaker polylite filaments, no real correlation. PC was the hardest, PETG softest.. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-HMXTeuhShaA.htmlsi=pNRxdMTPVak25DOG&t=1407
shouldn't white dyed filament be harder? titanium particles and all that. i would definitely be interested in seeing the results of the filament tests from same manufacturer, same material, same batch, just different colours. and would be nice if manufacturer would provide exact dye % they have used for particular filament.
Great video as always, i would have loved to see a reference filament from igus, since they do sell their filament online and it's not prohibitively expensive and has greas the same friction characteristics of the linear bushings
Yes, I know, that's why test with 6mm shaft is more important here. The 3mm I made from a bolt, chich is 5.9 mm, but that I could turn on the mill. The hardened shaft not. But even then, for me very useful was that test too (3mm shaft)
I really appreciate your dedication to presenting as proper an experiment as you can, by keeping everything as consistant and fair as possible, and developing the device to create the friction. Having quanitfiable numbers is much better than people feeling and eyeballing how the results compare. I'm working on a mechanism that will receive some wear from cables, and I had a feeling TPU would be good, but had no idea it would be this good, comparitively. Great video, thanks!
This content is so interesting. Thank you so much for posting! This is going to be very usefull for my 3D printed RC projects! Any plan to repeat the same with grease? And what about testing between printed rods and printed specimen? Printing orientation is for sure a key point.
Good idea for a test. I'm still watching the video, just jotting down some thoughts: dial indicators have some error and the amount of wear might be within error values. My first thought for measuring this would be to use weight: weight the part before, do the wear test, clean it thoroughly with compressed air, then weigh it again to see how much material was lost. Depending on the scale precision, that might be more accurate.
Hm, good thoughts, and new ideas, maybe I could repeat this test in near future with some rotating materials and measure the weight. I have some analytic scales with precision of 0.001g.
On a previous job, I did something similar but for deformation of different filament under temperature. Testing a lot of samples to get good data is pretty tedious and I respect the effort you put in, I know there are so many hours of work in the background that you cut out for the video. Well done :)
