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/diy/ - Do It Yourself

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2811012 No.2811012 [Reply] [Original]

I just found out you can cast molten metal on a mold made frst by 3d printing and then filled with s ceramic slurry. Sounds very elaborate however.

>> No.2811026

It's the same as lost wax casting, ypu just use a 3d print instead of wax. It needs to be a material that will burn out completely with minimal residue, though.

>> No.2811066

That was the intended purpose of 3d printers.
You weren’t supposed to make the actual things themselves out of the results.
PLA melts at 60 deg C, it’s practically wax or, more closely, hot glue.

>> No.2811088

Oof that actually really ups the impressiveness. I could probably go take over the world with a 3d printer

>> No.2811281

>That was the intended purpose of 3d printers.
Damn I was right! I always felt there was something off with people making gears and toys and shit out of 3D printed plastic, which is a relatively expensive material

>> No.2811289

>This is considered trolling these days.

>> No.2811294

Have any of you actually cast metal before?
Trying to pour molten metal into a plaster mold full of plastic is only going to end in tears or at best a shitty contaminated end product.

At least with lost wax you can melt it out cleanly in an oven before you pour the metal.

>> No.2811295

I use 3D printed moulds to make silicone parts all the time
Why do you think there's any trolling involved?

>> No.2811300

I don't think anyone is contesting that casting with plastic is a bad idea. The infinitely better idea is to use plastic to make a 2 part mold out of plaster or whatever and then use that to cast the part.
Wax is also a great option

>> No.2811307

Forget how many vids I've seen on youtube of people pouring molten metal onto plastic in a mold. Never can understand what they're expecting to happen.

>> No.2811328

My post is not even a paragraph and nobody can read the part that says ceramic slurry

>> No.2811445

It’s ceramic dust in water
In casting, it makes the final finish better.
Usually it’s just sand, and then they leave the rough finish, or machine off the critical areas.
Look at an engine block.

>> No.2811468

You're supposed to burn out the plastic before pouring.
Most I've seen burn out the plastic first.

>> No.2811501

Really the implications of this could be huge. Some people might want a custom bronze bust of some person they admire and I could sell it for lots of money or something.

>> No.2811502

Because the first printers were direct applications just as today. First a liquid metal one, then resin, then a decade later FDM and two decades more till somebody thought of using PLA. Which also melts at 170C, more than 100C more than undefined wax.
But sure, this thread isn't /g/ tier of bullshit.

>> No.2811588

Hey little googler…
The glass transition temp for PLA is 60 deg C.
At that point it’s too soft to reliably be anything in particular.
You’ve never had any experience with it, so I don’t blame you for not knowing anything about it.
It is common knowledge to not leave any PLA printed object in, say, a car parked in the sun.

Trying to either melt the PLA out before pouring, or, even more retardedly… trying to pour into the PLA and melt it out that way is retarded.

Obviously the 3D printed object is going to be used to impress the shape into a 2-piece mold. Afwr which, you coat thr i side with a ceramic slurry if you want it smooth.

The fact that you’d propose such a thing to refute is ridiculous.

>> No.2811603

You can kinda doom it but you get voids and slag inclusion

If you can setup a 3d printer desktop CNC isn’t a large step up I’d rather just do that than try to get all the polycarbonate liner out of a Mountain Dew can

Also i don’t think your mom would appreciate you digging a hole, and hooking her Dyson hair dryer to it to create a home foundry

Plus something something throwing molten dros in your neighbors pool against HOA

>> No.2811640
File: 67 KB, 827x808, callie_briggs_2_02_by_celsoryuji_d4r62lf-414w-2x.jpg [View same] [iqdb] [saucenao] [google]

Lost-PLA is an old technique by this point. You print the item, but it in a flask, cover it with investment, and then but it in a burnout oven.

After you've completed the burnout you can clean the inside of the mold with compressed air, then heat it back up and then pour your metal in

>> No.2811646

They also sell wax filament for this

>> No.2811900

What point do you think required googling? But nice goalpost.

>> No.2811958

> old technique
That doesn’t mean it’s a *good* technique.
Incest is an old idea too, but it doesn’t mean it’s a good idea. In fact, “lost-pla” probably originated south of the mason-dixon line.

> goalpost
My point is PLA is a crap material for making actual objects, and it’s a crap material for making metal objects.
A lot of PLA actually solves a big problem: the yogurt industry—especially greek yogurt—generates far more lactic acid waste than they know what to do with. So they re-package it as PLA and sell it to unwitting retards as “eco-friendly”

>> No.2812052
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>PLA is a crap material for making actual objects
maybe you're a shitty designer. it's not some dairy industry conspiracy, PLA doesn't smell is easy to work with and is fairly versatile. I have shit I printed 5 years ago still in service in direct sunlight. It's not the best choice for some thing (I've had a few GPS mounts melt in the car window) but it's still fine for prototyping and often application. e.g. only my auto stuff gets remade in PETG or occasionally ASA. It makes me wonder why you are so mad about PLA.

>> No.2812357

Retard here
Is there a material that DYI level 3D printers can use that is biodegradable, maybe a fatty oil based compound, that can be used to more simply neo-“wax cast” without added steps?
>burn out the plastic
No clue what this means.

>> No.2812389
File: 2.50 MB, 4160x3120, AluMacoCat.jpg [View same] [iqdb] [saucenao] [google]

I printed the cat with a single wall, top and bottom. I didn't even bothered with burning the PLA.

>> No.2812396

You throw the slurry covered print into a kiln for a few hours, which hardens the slurry and burns out the plastic.

>> No.2812463
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>> No.2812535

> myfordboy
I said, incest was a bad idea, didn’t I?