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Old 09-07-2020, 09:04 AM   #1
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Default 3d printed differentials

Hey guy's I'm trying to save weight on my 12s race 6x6 and I came up with the idea 3d printed differential gears that will be made of nylon x or polycarbonate filament thoughts?

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Old 09-07-2020, 12:03 PM   #2
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Default Re: 3d printed differentials

I think its going to fail very easily. I predict you'll get about 12" before these grenade.

I'd recommend looking for weight savings elsewhere.
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Old 09-07-2020, 01:58 PM   #3
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Canít say I would recommend that venture either.


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Old 09-07-2020, 04:04 PM   #4
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I think its going to fail very easily. I predict you'll get about 12" before these grenade.

I'd recommend looking for weight savings elsewhere.
It lasted in a car differential for a while so in a rc it should last, and porsche is 3d printing pistons

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Old 09-07-2020, 04:05 PM   #5
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Canít say I would recommend that venture either.


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Why?

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Old 09-07-2020, 04:15 PM   #6
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Why?

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Why? Plastic would deform quickly leading to failure. That would be the last place I would look to reduce rotating mass and rotational drag. If you havenít done so already I would get rid of the transmission and make it direct drive with a buggy centre diff or something of the sorts. Changing a diff to a 3D plastic would not cross my mind like ever.. itís just a bad idea. But what do I know, Iíve only been a machinist for 12years


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Old 09-07-2020, 04:28 PM   #7
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Why? Plastic would deform quickly leading to failure. That would be the last place I would look to reduce rotating mass and rotational drag. If you havenít done so already I would get rid of the transmission and make it direct drive with a buggy centre diff or something of the sorts. Changing a diff to a 3D plastic would not cross my mind like ever.. itís just a bad idea. But what do I know, Iíve only been a machinist for 12years


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It is a dual motor direct drive but I would think that since its in car differentials that it is fine for a rc car?

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Old 09-07-2020, 04:43 PM   #8
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It is a dual motor direct drive but I would think that since its in car differentials that it is fine for a rc car?

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Try it then. Unless you can hold tolerances less than .0015in on your printer and can print a material thatís stronger than aluminum youíll only be making things worse... a lot worse. Getting your plastic gears to mesh correctly and have less friction than a properly meshed hardened steel gear set will be far to much work for a substandard result.. Porsche or whoever has spent billions on R and D into 3D printing and I doubt anyone on this forum has a printer that can do what your thinking let alone have any success


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Old 09-07-2020, 04:46 PM   #9
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Try it then. Unless you can hold tolerances less than .0015in on your printer and can print a material thatís stronger than aluminum youíll only be making things worse... a lot worse. Getting your plastic gears to mesh correctly and have less friction than a properly meshed hardened steel gear set will be far to much work for a substandard result.. Porsche or whoever has spent billions on R and D into 3D printing and I doubt anyone on this forum has a printer that can do what your thinking let alone have any success


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Ok lets see how it goes then also the real car diff was printed on a ender 3 I believe from nylon x

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Old 09-07-2020, 04:51 PM   #10
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Ok lets see how it goes then also the real car diff was printed on a ender 3 I believe from nylon x

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Prove me wrong! I just know Iíve replaced every plastic gear/ rotating assembly piece thatís ever came on an rc and replaced it with the appropriate aluminum or hardened steel piece. Rotational friction of your current set up is what you need to reduce.


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Old 09-07-2020, 04:53 PM   #11
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Prove me wrong! I just know Iíve replaced every plastic gear/ rotating assembly piece thatís ever came on an rc and replaced it with the appropriate aluminum or hardened steel piece. Rotational friction of your current set up is what you need to reduce.


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Alright well lets see if i can prove u wrong thanks for ur feedback tho

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Old 09-07-2020, 06:08 PM   #12
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Default Re: 3d printed differentials

lets not forget you've said this will be on 12S, thats a tall fricken order that even the metal gears may struggle with. If the gears can hold up they'll be fighting friction and heat and I can see them fusing together if they can hold up for a while.

I'd love to be proven wrong, that would be cool. But it looks like this could be one of those "what do you guys recommend so I can ignore it" type threads.

Much of what Porsche and other big manufactures use for printing is on super high dollar machines.

Do you have a link to some info on their plastic gears? I am curious.

I do tons of 3D printing BTW so dont take me as a 3D printed part hater.

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Old 09-07-2020, 06:21 PM   #13
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lets not forget you've said this will be on 12S, thats a tall fricken order that even the metal gears may struggle with. If the gears can hold up they'll be fighting friction and heat and I can see them fusing together if they can hold up for a while.

I'd love to be proven wrong, that would be cool. But it looks like this could be one of those "what do you guys recommend so I can ignore it" type threads.

Much of what Porsche and other big manufactures use for printing is on super high dollar machines.

Do you have a link to some info on their plastic gears? I am curious.
Porsche is the one making pistons for their engine and I saw a nylon x diff on yt

Porsche 3d printed pistons https://www.cnet.com/google-amp/news...or-911-gt2-rs/

3d printed differentials https://youtu.be/7kd4ZLn-Ouw

3d printed lifting a car https://youtu.be/Z2XkdLy9pxE

And this tread was that I wanted to know what u guys thought about it not recommendations but still open to it no hate.

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Old 09-07-2020, 06:35 PM   #14
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Porsche is the one making pistons for their engine and I saw a nylon x diff on yt

Porsche 3d printed pistons https://www.cnet.com/google-amp/news...or-911-gt2-rs/

3d printed differentials https://youtu.be/7kd4ZLn-Ouw

3d printed lifting a car https://youtu.be/Z2XkdLy9pxE

And this tread was that I wanted to know what u guys thought about it not recommendations but still open to it no hate.

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Companies like Porsche are using multimillion dollar cutting edge of technology machines that might not be available to the average person

P.S. the guy who 3d printed a car different said a plastic diff was a bad idea at 8:07(minute)in the video

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Old 09-07-2020, 06:43 PM   #15
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Companies like Porsche are using multimillion dollar cutting edge of technology machines that might not be available to the average person

P.S. the guy who 3d printed a car different said a plastic diff was a bad idea at 8:07(minute)in the video
the car diff held up for a while the only thing im worried about is the gear teeth thickness and layer adhesion which hopefully i will find a work around any comment on the car lift/ transmission lift?

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Old 09-08-2020, 04:59 AM   #16
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Default Re: 3d printed differentials

Where the hell do you race a 12s 6x6!?
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Old 09-08-2020, 08:13 AM   #17
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Where the hell do you race a 12s 6x6!?
A race track where it can embarrass any touring car

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Old 09-08-2020, 02:30 PM   #18
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Default Re: 3d printed differentials

hmmmm I hope your not a betting man.

Last thing I'll point out is the size of the output shaft on the pinion, is a meager 5mm diameter and has a 3mm hole running through it. this area will be extrememly weak.


The axle shafts will also need something to key the tangs into and plastic wont cut it.

so at the very minumum you'll need metal outputs as well as a metal spool at which point..... why not just keep the metal gears.

Monthly Mayhem might have inspired this and if so I say great, go have some fun. But if you're trying to be competitive the only thing getting embarassed at the track will be you, no offense I'm just being realistic.

Just look at how much the TRX6 struggles with going straight and staying off its roof on a mere 4S-6S
https://www.youtube.com/watch?v=Eg9b...ilder%27sGuild

https://www.youtube.com/watch?v=d0Zi...=HarleyDesigns

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Old 09-08-2020, 02:54 PM   #19
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hmmmm I hope your not a betting man.

Last thing I'll point out is the size of the output shaft on the pinion, is a meager 5mm diameter and has a 3mm hole running through it. this area will be extrememly weak.


The axle shafts will also need something to key the tangs into and plastic wont cut it.

so at the very minumum you'll need metal outputs as well as a metal spool at which point..... why not just keep the metal gears.

Monthly Mayhem might have inspired this and if so I say great, go have some fun. But if you're trying to be competitive the only thing getting embarassed at the track will be you, no offense I'm just being realistic.

Just look at how much the TRX6 struggles with going straight and staying off its roof on a mere 4S-6S
https://www.youtube.com/watch?v=Eg9b...ilder%27sGuild

https://www.youtube.com/watch?v=d0Zi...=HarleyDesigns
I believe that if I get this light enough with the right shock oil downforce, rwd "for turn in response", super low cg and the correct active suspension tuning it will be just fine on the track also "I have a downforce idea that I will save for my next topic" And I had this idea but I wanted to save do this after my other air suspension trx6 build and the monthly Mayhem jumpstarted the project. And I will think about the output shaft weakness.

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Last edited by jemelumadu2; 09-08-2020 at 02:59 PM.
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Old 09-08-2020, 03:00 PM   #20
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Originally Posted by HumboldtEF View Post
hmmmm I hope your not a betting man.

Last thing I'll point out is the size of the output shaft on the pinion, is a meager 5mm diameter and has a 3mm hole running through it. this area will be extrememly weak.


The axle shafts will also need something to key the tangs into and plastic wont cut it.

so at the very minumum you'll need metal outputs as well as a metal spool at which point..... why not just keep the metal gears.

Monthly Mayhem might have inspired this and if so I say great, go have some fun. But if you're trying to be competitive the only thing getting embarassed at the track will be you, no offense I'm just being realistic.

Just look at how much the TRX6 struggles with going straight and staying off its roof on a mere 4S-6S
https://www.youtube.com/watch?v=Eg9b...ilder%27sGuild

https://www.youtube.com/watch?v=d0Zi...=HarleyDesigns
And I had this idea but I wanted to save do this after my other air suspension trx6 build and the monthly Mayhem jumpstarted the project. And I will think about the output shaft weakness.

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