Hey everyone my name's Chris and I just can't stop making things, except for today I'm stopping
making my knight armor which is almost done because I got some stuff in the mail called
Oyumaru. Oyumaru. Oyomaru? I don't know but it's a mold-making material that is flexible...
I just saw some dust floating by...
which is a flexible, reusable, mold making product which apparently has been
around for a long time but I'd never heard of it so I want to try it out and maybe you've
never heard of it either and maybe it would be helpful for you too.
So let's see if it's any good. If it is, super.
Alright, Oyumaru comes in these little packages of sticks that have
no English writing on them so I have no idea what they say except there is a warning on the back.
So...be warned.
My first impression is that they are rubbery and very strong rubber at that.
I can bend the stick right back against itself and there's no splitting which
really surprised me. I thought it would fail at some point.
In order to use Oyomaru you need to make yourself a cup of tea in a fancy mug,
then pour the remaining hot water in an equally fancy container.
Drop in your Oyamaru and give it a few minutes to soften while you happily drink your tea.
If you're not happy gaze at the pretty blue color of the stick and you will be.
Fish it out without burning your fingers
and you can start squishing, which is fun if you like squishing things. Which I do.
Of course, as the Oyomaru cools down it goes back to its original rubbery form.
Here you can see me trying to tear a thin sheet of it I made and it's surprisingly strong. However,
I did manage to tear it with my massive finger muscles. Now the great thing is my fooling
around hasn't wasted anything. I can just throw those pieces back in the water and reuse them.
Now let's do something useful.
Say you had a dugong brooch and you wanted to make a duplicate.
You could grab a lid from a random bottle of paint to use as a mold frame,
squish some Oyomaru into the lid, and push your dugong into the Oyumaru.
Kinda looks like he's swimming in the ocean.
Now patiently wait for it to cool or impatiently put it in your freezer for a few minutes.
I wasn't sure if I'd be able to get it out of the lid once it was cool but
Oyomaru surprised me again. It came out great.
Next I tried filling my mold with some FOMO foam clay
and the result was really quite good.
Now I have a foam dugong, but is that really enough dugongs
for one person?
I didn't think so,
so I thought I'd test if you could use an Oyumaru mold to make an Oyamaru dugong.
I squished the clear Oyomaru into the mold,
waited for it to cool and was able to pull the two pieces apart
which is really cool because it means
this product will be good for making two-part molds as well.
Clear rubber dugong. Nice.
I also tried with another thermoplastic: polycaprolactone or PCL.
It worked too. One thing I did
was cut air vents at the tips of the fins to prevent air from getting trapped and
stopping a complete fill of the mold.
At this point I decided to try a two-part mold and see how that works.
Bye-bye dugong mold.
I grabbed a man in a business suit and stuck him in some warm soft plastic.
He seemed really happy about the whole thing.
I used the end of a broken stick to refine the edges
where the Oyumaru was touching the businessman.
This will become the parting line for the mold.
I made some indentations to help the molds line up when I was done
and let the mold cool. Once cool I gave it a light coating of water to help it not stick
and heated up some clear Oyomaru for the top half.
Squished it down on top of him and left the happy businessman to cool.
Once cool I pulled the two halves apart which wasn't quite as easy as I expected
but still worked and it sounded a bit like this
for this casting, I wanted to try some epoxy putty
but the only epoxy putty I had was just hardware store variety epoxy putty
definitely not made for making molds and therefore a little bit messy
and hard to work with. I filled each half of the mold separately
and then squished them together.
The problem with this type of casting is you have to be really accurate
with how much material you put in each half.
If you put too much you'll have tons squeezing out the edges and if you
put too little you won't have a complete fill. Turns out I put a little too much.
I lined up the molds and I squished as hard as I could.
Once the epoxy had hardened I pulled my businessman out of his mold
and spent some time cleaning him up.
As you can see the excess putty squished out the sides and also made it hard to
line up the halves properly
which is why his body isn't quite perfect,
but hey, that's business.
So, Oyumaru. How good is that?
Pretty good. I love this stuff actually.
My expectations have been overly exceeded.
I did not expect this stuff to be this good or this tough, this strong. You can't break it.
It's rubbery...
it's fantastic, you can put two halves together and they don't stick together,
pull them apart you got a two-part mold...
um... what else...
You can get it in clear and you
can see through to see your mold - that's really handy.
Probably the only downside is you can't use
something hot in it like, say,
fill your mold with hot glue, because that would just melt the Oyamaru
and it would probably just merge into a big mess so there's that limitation.
Other than that
it's a great material. In fact, I think you could use this Oyomaru for other stuff
besides mold making like say for rubber, I don't know... bumpers or stops. It's about
the same sort of... what's the word for it... is it durometer? Or elastometomer?
Something like that.
Kind of like a skateboard wheel
but like a soft skateboard wheel if you know what I mean
so it feels really durable. I think you could use this for other things like
...something...
I don't know what, but it's going in my brain for the next time I need
a hard rubbery thing that needs to be molded to a certain shape -
boom, got it.
So yeah, great stuff, glad I bought it. I'll definitely use it sometime when I need it.
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okay
you