You can probably cheat the system where this is concerned (haven’t tried it though). Simply tell it that you are printing PLA in the left nozzle by using a TPU profile that is labeled PLA. You will need to preload the left nozzle, but once loaded it will stay loaded. The left nozzle issue is mostly the unconstrained section that tends to let TPU wonder, so once you fiddle with it to load it, you should be able to do the 2 color printing pretty seamless. That said… you may need to disable retraction if you get odd buckling.
I dont really worry, ill find my way around that, even if i need to modify the filament path to make more restrictive (yes you need easier flow in the path, but if the path is too wide, your TPU will just have room to tangle inside the ptfe I.e.)
Retraction is always off apart from when I need to raise the speed a bit. Retraction in TPU is more usefull as a means of backpressure relief, rather than for stringing , I dont have any stringing anyway, so im good using it for that.
Eh for now honestly I havent even tried TPU on H2D yet, im behind in schedule with my produciton so for now I just push forward till I have more time for experiments 
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A little off topic, but I was curious to hear from folks that have tried Sirya Tech’s Foaming TPU. Considering its sold out in a couple of weeks, I’m thinking it might not be too bad. Anyone yet?
Flex TPU Air 65A-82A Filament
Νot me, i generally try to stay away from varioshore types , for 2 reasons. 1 lots of times, depending on the blend, it wont blend with my other TPUs, 2nd its usually hell expensive for what it offers and the rate I go through the rolls. Out of curiosity how much does that go for?
Its reasonable, $49.99. A little more than most 85A’s. And that is for a full KG, so you could legitimately get close to 1.5 - 2.0 kgs of printing, depending on the hardness you desire.
No thats indeed reasonable considering its varioshore. I might grab couple rolls if i get the chance, but still not really needed in the production i do, but ill probably find a use for it soon
Yea for real, I like to be pretty conservative with risk vs. reward so I usually stick with 90a which has been very reliable and still soft “enough” for what I’m using it for.
Correct, remove the AMS tube and use the bypass port on the back of the H2D. I would encourage you to use Google or YouTube for a more thorough explanation.
oh no im up for new TPUs , its not really a risk for me, its my field of expertise after all. But I need a usecase and as the things are now, I need black in one hardness only, and that is 83 , which I get for abit under 20 euros. My biggest complain is I cant find some colors that I might need, regardless of hardness.
And especially Silver and Gold . I did find couple brands but hell… its the first time I see a filament go from 1.75 to 3, then to 1.2, then back to 2.5 for about 20 meters and going…
And that was in both the first roll bought AND the replacement after returning it. So yeah, I just pray the brands I know that have EXCELLENT materials and consistency might get an interest and produce more interesting TPUs.
Heres a piece of my work 5 different blends here. all tpus
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What printer did you use for that? It looks amazing
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That one came from a neptune4max, but thats my general quality, all my machines (the ones dedicated to TPUs) are tuned to get this result consistently.
Oh and btw, all of them run 0.4 nozzles.
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If you haven’t seen it, this is a valuable video for getting the most out of variable hardness “foaming” TPUs:
Thanks, I’ve seen his video, but honestly I used foaming filaments before. I was just curious if Siraya Tech’s was a good one.
Interestingly, someone did a video on Siraya Tech’s foaming TPU today and it showed me everything I was curious about, so when its back in stock, I’ll likely grab a roll.
That is cool as hell, the print looks flawless. That’s inspiring to use more TPU… 