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3D printed parts: Any success stories?

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Old 01-30-2021, 02:25 PM
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Meatful
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Default 3D printed parts: Any success stories?

After finding another teensy bit of OEM plastic listed for US $30 I wondered--any of you clever lot printed any parts and used them successfully?
Old 01-30-2021, 03:40 PM
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GT6ixer
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Hey Meat. Yeah there are a few of us using 3D printed parts in our 928s. 3D printing is huge passion of mine and I have developed a few parts for some NLA bits on the 928. There are a lot various materials and production techniques to consider but in general it's a great tool for us classic car owners.

I would say that 3D printing isn't something you generally would consider to save money from buying a part that was plastic injection molded. That part is always going to be way cheaper than a 3D printed part. 3D printing really comes into play when you need to make something that one, doesn't exist or two is no longer in production.

Last edited by GT6ixer; 01-30-2021 at 03:44 PM.
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Old 01-30-2021, 03:49 PM
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Originally Posted by GT6ixer
Hey Meat. Yeah there are a few of us using 3D printed parts in our 928s. 3D printing is huge passion of mine and I have developed a few parts for some NLA bits on the 928. There are a lot various materials and production techniques to consider but in general it's a great tool for us classic car owners.

I would say that 3D printing isn't something you generally would consider to save money from buying a part that was plastic injection molded. That part is always going to be way cheaper than a 3D printed part. 3D printing really comes in the play when you need to make something that one, doesn't exist or two is no longer in production.
Do you know if there are any businesses that do "one off" 3D printed parts? If so, can you share some links? Also if you have any links to learn about 3D printing in general, I would love to see them.

Been considering researching 3D printing lately, just haven't gotten to it yet. The mfr of my Alta dirt bike is out of business and I've been considering trying to have some of the plastics 3D printed. My inquiries to hobbyist 3D printer folks led me to believe the parts would not be sturdy enough, but I'm wondering if that is correct since there seems to be all kinds of 3D printing going on with all kinds of materials. Whether or not its affordable or not is another matter.

Anyway, any input is appreciated, thanks. -Ed
Old 01-30-2021, 06:17 PM
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I printed speaker adapters for any 4" speaker to adapt to the thread on screens.
https://benno928.wordpress.com/2018/...eaker-upgrade/

Now if only someone would make new rings!
Old 01-30-2021, 06:35 PM
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Hey Ed. There are many design and rapid prototype businesses that can make custom parts. Most of these.however are focused on supporting large companies and not set up to design small runs of bespoke parts for individual customers. 3DHubs used to do this, think Etsy for hobbyist 3D printing enthusiasts. They have since changed their business model and only manufacturer designs that you send to them.

So that's something to be aware of with 3D printing. The printing part is just one aspect of getting to the final part. Before you can print you need a CAD model of the part. Designing that part is what, IMO, keeps a lot of people away from 3D printing. You need to learn CAD design but that takes a lot of time to get proficient. The alternative to this is to find a CAD model of the part you want and just download it and start printing. There are dozens of places to find them and are literally millions of free things to download. However that doest help you if you need a custom part that never existed before or are looking to make a part for your car that broke or is no longer available from the part suppliers. In that case you need to reverse engineer the part in CAD. This can be a very time consuming process. But it's not impossible and in fact for me is the most rewarding process I go through when printing NLA parts.

Once you have a CAD model you can now print. There are a lot of things to consider when printing and honestly the best way to learn in the beginning is just by trial and error. Here is a really good series of videos on the basics of 3D printing. This will give you a good overview of what's involved.

https://youtube.com/playlist?list=PL...fQ6Uj8x7meNJJx


​​​​As far as making strong enough parts with a DIY printer the short answer is, yes that is completely doable. A lot of it depends on the material used, but just as much or more depends on the design of the part. A simple example of this is if you were replacing an aluminum part of a given thickness with a plastic 3D printed part you would need to make the 3D printed part much thicker to have equivalent strength.

Hope this helps clear up a few of your questions and let me know if you ha e anymore. Happy to answer them!

Last edited by GT6ixer; 01-30-2021 at 06:42 PM.
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Old 01-30-2021, 08:16 PM
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Here's a great thread on this from 944-land: https://rennlist.com/forums/924-931-...iscussion.html If you read through to the end, someone on that thread bought a resin printer and oh my goodness is it impressive (and $$$).

Really, though, you've got the right person on the line with @GT6ixer , as I know from reading posts on this forum how passionate he is about it.

Cheers
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Old 01-30-2021, 09:09 PM
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If you have a design for the part you need, there are also printing services that can print metal parts using laser sintering.

My employer will occasionally get tooling this way, when a tool needs to be heat resistant.
Otherwise, we will prototype parts in plastic, or build one off tools to accommodate the strengths and limitations of being made from plastics that can be printed.

I haven't found many 928 parts absolutely to download, but do find many VW and MB parts for other vehicles that I have owned or currently do.

Last edited by Hey_Allen; 02-01-2021 at 01:02 PM.
Old 01-30-2021, 09:26 PM
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Had a work colleague get some bumper hole covers printed for his car from this place (https://www.shapeways.com/). I don't remember exactly what it cost, but they worked out well for what he was looking for.

Originally Posted by Hey_Allen
If you have a design for the party you need, there are also printing services that can print metal parts using laser sintering.

My employer will occasionally get tooling this way, when a tool needs to be heat resistant.
Otherwise, we will prototype parts in plastic, or build one off tools to accommodate the strengths and limitations of being made from plastics that can be printed.

I haven't found many 928 parts absolutely to download, but do find many VW and MB parts for other vehicles that I have owned or currently do.
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Old 01-31-2021, 07:34 AM
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Anyone 3D printed a cover for broken center console HVAC sensor button. I know Classic 9 sells the Jager one now, but just looking at other options.
Old 01-31-2021, 01:29 PM
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I've printed a couple things, mostly because I was too impatient to wait for parts and wanted something fixed that day. For the most part they've worked pretty successfully.

Sunroof slides (still working after 2 years):
Attachment 1340653


Hatch latch insert (worked enough for electric release to work until Roger's replacement arrived):
Attachment 1340654


Shift coupler bushings (been good for a year and a half so far):
Attachment 1340655

Attachment 1340656


Window roller (lasted 2 years until I replaced while the door was apart):
Attachment 1340657

Attachment 1340658
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Old 01-31-2021, 01:33 PM
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Originally Posted by GT6ixer
Hey Ed. There are many design and rapid prototype businesses that can make custom parts. Most of these.however are focused on supporting large companies and not set up to design small runs of bespoke parts for individual customers. 3DHubs used to do this, think Etsy for hobbyist 3D printing enthusiasts. They have since changed their business model and only manufacturer designs that you send to them.

So that's something to be aware of with 3D printing. The printing part is just one aspect of getting to the final part. Before you can print you need a CAD model of the part. Designing that part is what, IMO, keeps a lot of people away from 3D printing. You need to learn CAD design but that takes a lot of time to get proficient. The alternative to this is to find a CAD model of the part you want and just download it and start printing. There are dozens of places to find them and are literally millions of free things to download. However that doest help you if you need a custom part that never existed before or are looking to make a part for your car that broke or is no longer available from the part suppliers. In that case you need to reverse engineer the part in CAD. This can be a very time consuming process. But it's not impossible and in fact for me is the most rewarding process I go through when printing NLA parts.

Once you have a CAD model you can now print. There are a lot of things to consider when printing and honestly the best way to learn in the beginning is just by trial and error. Here is a really good series of videos on the basics of 3D printing. This will give you a good overview of what's involved.

https://youtube.com/playlist?list=PL...fQ6Uj8x7meNJJx


​​​​As far as making strong enough parts with a DIY printer the short answer is, yes that is completely doable. A lot of it depends on the material used, but just as much or more depends on the design of the part. A simple example of this is if you were replacing an aluminum part of a given thickness with a plastic 3D printed part you would need to make the 3D printed part much thicker to have equivalent strength.

Hope this helps clear up a few of your questions and let me know if you ha e anymore. Happy to answer them!
Thanks so much for the detailed response! Some good links for me to explore and learn from, thanks everyone. -Ed
Old 01-31-2021, 04:23 PM
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Originally Posted by Petza914
Anyone 3D printed a cover for broken center console HVAC sensor button. I know Classic 9 sells the Jager one now, but just looking at other options.
Are you referring to the temperature sensor bezel? Not exactly a button per se but a vent in the dash that draws in the cabin air down to a temperature sensor? If that's what you are looking for I make a replacement. It's not like the Jaeger one which is just an adhesive cover. I have recreated the entire piece to replicate the stock part. Here is a link to the thread about them:

https://rennlist.com/forums/928-foru...l#post13856135

If you are interested in one PM me. I have a bunch ready to go.
Old 01-31-2021, 04:43 PM
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Originally Posted by GT6ixer
Are you referring to the temperature sensor bezel? Not exactly a button per se but a vent in the dash that draws in the cabin air down to a temperature sensor? If that's what you are looking for I make a replacement. It's not like the Jaeger one which is just an adhesive cover. I have recreated the entire piece to replicate the stock part. Here is a link to the thread about them:

https://rennlist.com/forums/928-foru...l#post13856135

If you are interested in one PM me. I have a bunch ready to go.
The details on those look really good. Are you using an SLA printer? Far better than anything my cobbled together davinci printer with an e3d hotend can do.
Old 01-31-2021, 06:32 PM
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Originally Posted by captainOCD
The details on those look really good. Are you using an SLA printer? Far better than anything my cobbled together davinci printer with an e3d hotend can do.
Thanks. Yeah I make these on a Formlabs Form 2 using one of their engineering resins. I also have a Prusa i3 M3 which I used to prototype these in PLA and there is no comparison is surface quality. Not to mention that the material properties of the SLA resin is far superior to PLA.
Old 01-31-2021, 06:42 PM
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The best surface finish I've been able to get with my fdm printer has been abs put in an acetone vapor chamber. I don't really like printing with abs though. I've been using primarly petg anymore.


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