Acrylic Mold Box


Decided to try casting this keychain using urethane resin and metal powders for cold casting metal effects so I put together this acrylic box for making a silicone mold.

Normally I’d use melamine or MDF for the base and craft sticks for the walls on something like this, then hold it all together with hot glue… nice and real “science project” looking… :slight_smile: Then I figured, this isnt much material usage and it would look much tidier, and I dont feel like waiting for the glue gun to heat up when the laser is already on and ready to go… so I made the parts on the laser and opted for permanently welding it all together to avoid the inevitable thick hot glue joints that always allow a little silicone seepage.


Love the finished product! And of course your laser cut box mold makes it even cooler


Oh I really like that! (Did you engrave the acrylic to create the badge too, or just use the box to hold the molding material?)

Turned out fantastic! :grinning:


Yes, the badge model is engraved acrylic. This is the same badge I posted here before but now with lots of hours into vectorizing and image clean-up.


It looks so much sharper, I thought you’d just done a mold. Great job on the vectorizing!


That looks fantastic!!


The details are great… I love the design! That’s really good work!


Thanks guys!

@Jules, I’ll pour the mold tomorrow. I know silicone will pull every detail, I just hope it doesn’t pull apart in the fine areas. :slight_smile:


Wow, that is so cool! I’d love to try it.


that is so smart to do the acrylic cut, and then make resin copies! I have been messing around with moldmaking, but didnt think of doing it for acrylic items.


Is there no kind of release agent to coat the model with? Wax injecting rubber molds uses silicone spray.


Yep! I do this for 3D printed items as well. Casting copies lets you choose your own material for the properties and special effects you need, as well as being way faster to cast duplicates.

I don’t use the silicone sprays, the particles settle on any surface they can find in the workspace and if you need to glue/bond or paint other projects in the same area, it will present a ton of problems from fisheyes in paint surfaces to just not being able to get anything to stick.

I do use talc powder though, just not for casting the mold from the model.


And the first finished mold. This one has some teeny air bubbles on the surface and looks like the inside of a “D” and “Q” had air bubbles stuck in them but all in all, came out great. Definitely good enough to test out some metal cold casting techniques.


Thats super cool

I seriously would never get anything done if I gave in to my desires to try all these cool things that I see on this forum LOL I guess I will just have to live vicariously through you guys


Shut the front door! I have been wondering whether or not it would be possible to create molds for PMC. Thank you for exploring this theme and for sharing your findings here.


I have the first test part in the mold right now. It won’t be ready to demold til Sat morning because I only have slower cure resin on hand for making thicker castings. Used aluminum powder so I’m not sure how it will turn out. I normally use the aluminum just for dissipating heat in larger castings.


Cool! I’d love to know your formula for metal cold casting. Can’t wait to see how it turns out.


One way to deal with potential problems with bubbles in investment casting is to first paint the model with the investment using a brush to ensure coverage in high detail areas.


Gonna be a while still to see the cast part, it’s too flexible to demold and try to buff up the surface to bring out the aluminum luster.