heinzboehmer's 2002 Topaz 6MT Coupe

[heinzboehmer]

It did look 90* but I didn't spend a bunch of time staring at.

When it cools down outside I'll pull it apart and compare to a stock one.

Thanks!

Are you planning on running the PETG part? Curious how it'll hold up to engine bay temps.

[Obioban]

Thanks!

Are you planning on running the PETG part? Curious how it'll hold up to engine bay temps.

Pretty sure it won’t 😜

[George Hill]

Thanks!

Are you planning on running the PETG part? Curious how it'll hold up to engine bay temps.

Yes I am, I am also curious to see how it holds up too. I have PETG printed part in an intake system of a car that's been going for 2-3yrs now and its holding, but I think that one is not in as high of a heat affected zone as this part.

[heinzboehmer]

Pretty sure it won’t 😜

Yeeeah I don't really expect it to survive the Texas summer, but still a fun experiment.

[Obioban]

Yes I am, I am also curious to see how it holds up too. I have PETG printed part in an intake system of a car that's been going for 2-3yrs now and its holding, but I think that one is not in as high of a heat affected zone as this part.

Why not just use ASA?

[George Hill]

Why not just use ASA?

Because this is the cheapest filament I have and since it’s printed it costs me nothing more to find out.

Heinz and I chatted about filament material already. We both know PETG is not the right material here but I’d rather throw away $7 of petg vs $20 of something else if the file wasn’t 100% on.

[heinzboehmer]

Why not just use ASA?

What George said!

Another thing is that ABS/ASA are kind of a pain to print without deformation, so probably not the best for this test fit. Also not sure ASA would survive the heat, I measured 80 C at the firewall on a cool day with none of the HVAC plastics in place. I think it can easily get past 100 C back there.

[heinzboehmer]

Life got busy, so haven't had too much time to work on car stuff. I did manage to chip away at the HVAC plastics design, though.

Firewall plug is basically done. Here's what it's gonna look like:



Sealing is bit of a challenge with this design. This part needs to seal against the firewall, the removable insert (dark blue part), the filter housing and the braces. Gonna be printing out TPU gaskets for all of that. Here's a clearer view of most of the sealing surfaces and the associated gaskets (light blue and grey):



The removable insert still needs some work. Need to model in the gaskets for the braces and the fastening point to the cabin air filter housing. Should be fairly straight forward to do.

Plan is to have the insert be held up against the firewall plug with magnets, then fastened to the filter housing using the OE hardware.

Printed the firewall plug (no insert) out of PET-CF. My mind is blown every time I see this material get printed, surface quality is just nuts:



As mentioned previously, the whole thing is too big for the printer, so I sliced it up into three parts and printed some dowels to locate all the pieces together. I made the dowels separate parts so that they could be printed in a favorable orientation:



All glued up:



And installed (gaskets still to come):



This is where I should have stopped, but I'm doing a track day at Thunderhill tomorrow and it's forecasted to be >90 F, so I definitely want some thermal insulation. Cabin air filter housings are like $30 on eBay, so I horribly hacked mine up to fit:



Sidenote: I forgot to swap the blade on my oscillating cutter and accidentally confirmed that the material that the part is made of is definitely glass fiber reinforced



Absolutely does not seal, but at least it'll protect against most of the radiant heat:



Also, this is really cool. First sneak peek at the fully assembled engine bay:



I'm honestly really, really happy with how inconspicuous it is.

More to come...

[Mike RT4]

Any plans to offer it as a kit ? And what changes required for RHD ?

[heinzboehmer]

Any plans to offer it as a kit ?

I'll be sharing all the design files when I've finished with everything. I don't really have the time/willingness/etc. to assemble a kit myself and sell it, but anyone is welcome to use/modify my design.

And what changes required for RHD ?

I think none! The windshield mount is the only thing that would be different between LHD and RHD, but I landed on a design that's symmetric, so it should work for both. Let me know if you want the STL to print out a prototype for testing on your car.

[Mike RT4]

I appreciate that it would be a ball ache to reproduce.

Once fully finished, would you be able to list all the third party places you used to supply everything needed and all the final iterations of the STL files etc all in one place so that any one can replicate?

[heinzboehmer]

Oh definitely! Once it's 100% finished, I'll need to sit down and condense all the erratic thoughts I've written down here into some concise format. Will likely create assembly and install instructions of sorts.

Will be useful to anyone trying to replicate, but also to myself. There's no way I'm remembering all the nuances associated with this project a year from now

[Obioban]

Printed the firewall plug (no insert) out of PET-CF. My mind is blown every time I see this material get printed, surface quality is just nuts

ummm... ordering.

That seems amazing for parts in visible places. Tired of sanding/painting plastic :P

[heinzboehmer]

ummm... ordering.

That seems amazing for parts in visible places. Tired of sanding/painting plastic :P

It's pretty amazing. I'm curious to try PPA-CF as well, but that's significantly more expensive.

I'm also still unsure whether or not I like handling these CF reinforced plastics. Prusa ran some tests on their filaments and came to the conclusion that they're fine, but not all the other filament manufacturers are doing this: https://www.reddit.com/r/3Dprinting/...prusament_lab/

I will absolutely wear a respirator and gloves if I ever need to sand any glass/CF reinforced parts, but maybe I should be more careful whenever I'm handling the materials.

[Obioban]

It's pretty amazing. I'm curious to try PPA-CF as well, but that's significantly more expensive.

I'm also still unsure whether or not I like handling these CF reinforced plastics. Prusa ran some tests on their filaments and came to the conclusion that they're fine, but not all the other filament manufacturers are doing this: https://www.reddit.com/r/3Dprinting/...prusament_lab/

I will absolutely wear a respirator and gloves if I ever need to sand any glass/CF reinforced parts, but maybe I should be more careful whenever I'm handling the materials.

After writing the post above, I've been researching filments till now... and ended up ordering Prusa's PETG CF. From what I gather, surface finish is a little better still, in exchange for heat tolerance-- so won't be using it around exhaust bits.

... going to save it for special occasions. Really went down this road because I want to print a bezel for the trailer brake controller I just ordered for the Land Cruiser.