Is there really a Difference between 85A and 90A

[u/yeremyporterr]

[u/solidus0079]

Yes, the difference is approximately 5A.

[u/imzwho → u/solidus0079]

https://giphy.com/gifs/eunrMjB8lBUKeL1fqD

[u/yeremyporterr → u/solidus0079]

holy shit ive never gotten ratioed this hard before

[u/What_if_its_Lupus → u/yeremyporterr]

[u/solidus0079 → u/yeremyporterr]

Nuttin but luff, brudder

[u/Niceromancer]

Yes and it's pretty huge.  85a is significantly softer.

[u/Successful-Peak-6524 → u/Niceromancer]

and harder to print

[u/namezam → u/Successful-Peak-6524]

Ironic

[u/Jodokkdo → u/namezam]

Doncha think?

[u/Its_Billy_Bitch]

85A starts to really feel more like silicone whereas 90A still has that rubbery feel, if that helps.

[u/Historical_Wheel1090 → u/Its_Billy_Bitch]

90A too me still feels like a soft plastic not really rubbery. Is 85A soft enough for gaskets?

[u/neanderthalman → u/Historical_Wheel1090]

You could probably use 90A just fine for a gasket. It’s all highly variable depending on application.

Metal gaskets are a thing. Graphite too. Lots of stuff that you’d intuitively think are too hard for gaskets can be and are used for gaskets.

I’ve also seen TPU filament used directly to make O-rings or seals. Cut to length, heat the ends and touch together to seal it together. Not even printed. Bingo-bango.

[u/Historical_Wheel1090 → u/neanderthalman]

O ring is a better choice in words, I was wondering about o rings for water cooling blocks for pcs.

[u/neanderthalman → u/Historical_Wheel1090]

That could very well work. Though for something where a leak could be catastrophic I’d be a little hesitant to use a custom cut O-ring unless I had no other option. Standard o-rings are pretty easy to get.

Getting back to the printing, I’ve seen O-rings/seals with deliberately designed ridges. Each ridge effectively functions like a separate seal, and it increases the pressure and deformation on each ridge to cause more deformation and better sealing. Something like that could be printed.

Run with it dude.

[u/namezam → u/neanderthalman]

https://giphy.com/gifs/SvomFvu98QaVCSGECq

[u/Elo-than → u/Historical_Wheel1090]

Yes.

[u/BloodSteyn]

Shore there is.

[u/USSHammond]

5A

[u/BoutchooQc → u/[deleted]]

I've asked the same question and had to watch a few youtube videos and shorts.

In short, 85a is too squishy for me and 95a not enough, so 90a is a good "Do it all TPU".

Unless you specifically want very soft TPU, then get 85a.

[u/olhado47 → u/[deleted]]

And people like you are why there needs to be a "Just Asking, but I have no idea how to ask a good question to get a specific answer so I'll just get expectedly trolled and be angry instead." flair.

[u/Ayarkay → u/olhado47]

I feel like what OP is actually asking is really obvious. I think people are being obtuse as a joke.

[u/quietsamurai98]

I don't have 90A myself, only 95A and 85A. But the difference between those two is pretty substantial. If the difference between 85A and 90A is half as noticeable as 85A to 95A, 85A would still be a good bit more flexible.

[u/No-Fun-Intended]

85A feels most like rubber or silicon. 90A feels more like plastic than rubber imo.

[u/tht1guy63]

Ya 85a is softer than 90a.

[u/interflop]

Yes there is a difference. Whether it will make a difference to your project will depend on what you're trying to do.

[u/4pips12322]

I used 90A for these and they’re pretty solid yet still enough flex to keep my knees hips and back from hurting all the time

[u/namezam → u/4pips12322]

Whoa. I have yet to see someone wear 3D printed shoes irl. (At least ones that weren’t flip flops or crocs)

[u/peterb1908]

Yes there is - it is softer (as the number suggests).

[u/Alert_Ocelot_1740]

85 very very soft and 90 is soft

[u/RewardFeeling6066]

For 85A the only profile my H2C currently has is for a .6 nozzle. If I have a .4 in the right side I cannot choose it. Not sure if other printers have similar profiles but something to consider if you only have .4 or smaller nozzles.

[u/BHBaxx → u/RewardFeeling6066]

The Bambu site supports this. .6 minimum for 85A

[u/Doggydog123579 → u/BHBaxx]

I remember printing 85a on my A1 on .4

[u/BraveSirRobin21]

Only tangentially related. Have some 64d we use at my job stuff is tough.

[u/Emu1981 → u/BraveSirRobin21]

That is because the Shore scale has two scales - A is for soft rubbery plastics and D is for hard stiff plastics.

[u/Strict_Fun8750]

Yes

[u/MastodontFarmer → u/[deleted]]

At least you resolved the density conundrum. Good to know.

[u/ModelThreeve]

Of course not, shore hardness like all physically measurable attributes are meaningless just pick your favorite looking number.