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3d Printing a mold?

Posted by audiobull 
3d Printing a mold?
October 19, 2016 02:03AM
I am wanting to scan a car part for an old vehicle of mine and then get a new one poured at a foundry.

Can I scan the item. 3d print it using some sort of filament and then send it off to the foundry? I though this forum section was for just that but I seem to reading posts about injection molding rather then moldmaking.
VDX
Re: 3d Printing a mold?
October 19, 2016 04:44AM
... ask the guys at the foundry, what's best for them.

Here in Germany I can send them a "positive" part for making a mould (did this with some SLA-fabbed parts) or a part made from wax for a one-off lost-cast-moulding ... or only the CAD-data, so they will 3D-print the mold on their own - but then pretty expensive too eye rolling smiley


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
Re: 3d Printing a mold?
October 21, 2016 04:13AM
Thank you VDX

Is there a wax filament available on the market or do I need to make a cast and then pour wax in?
VDX
Re: 3d Printing a mold?
October 21, 2016 05:01AM
... wax is, when molten, not viscous enough to be usefull for FDM printing - it's mostly used with "ink-jetting" types of 3D-printers.

You can 3D-print a cast to make a wax counterpart.

But IIRC, you can use parts printed from PLA for lost-cast moulding too, as it will burn/evaporate without residues too ...


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org]
Call for the project "garbage-free seas" - [reprap.org]
Re: 3d Printing a mold?
June 19, 2018 03:46PM
Quote
VDX
... wax is, when molten, not viscous enough to be usefull for FDM printing - it's mostly used with "ink-jetting" types of 3D-printers.

You can 3D-print a cast to make a wax counterpart.

But IIRC, you can use parts printed from PLA for lost-cast moulding too, as it will burn/evaporate without residues too ...

machinablewax.com has a wax filament. its very prone to warping so i would highly suggest a heated chamber before printing large objects but it does print pretty darn well.
Re: 3d Printing a mold?
June 21, 2018 07:06PM
You can 3d print a mold using a filament called polycast and probably others, which prints like PLA but burns off better. You cannot scan a part and expect it to come out properly though, for one thing your print will shrink as the plastic cools, secondly the cast metal you make will shrink as the metal cools. You can design the part and design it with the shrinkage in mind, I know Solidworks can even alter a design for casting.
Re: 3d Printing a mold?
June 22, 2018 10:16AM
I will add, I don't know how much force the part is going to take. If it is an area that will require something of high strength, than finding a part that was forged would be better, if it doesn't receive a lot of force like a manifold than casting is a solid way to manufacture it.
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