Silver casting help needed

[clare.ryalls@gmail.com]

Hi,
I am new to a lot of this has so apologies if this is a daft question!
I need to send a mould off to a caster which I have never done before. One caster has advised I can send them my metal clay version that I have made but as I need a few different sizes this seems an expensive way of doing it. Another has advised I can send them a mould in clay, wax or anything that isn't too porous.
The mould I need is an acorn cup which I've been making in metal clay which is proving too expensive.
I only have basic kit - so I'm assuming my butane hand held torch won't heat silver enough to make a mould using delft clay?
Any suggestions as to the best way I can do this would be really welcome as I'm going round in circles with it now!
Thanks

[Dennis]

3D printing seems an obvious option if you need different sizes.

You could cast your self using Delft Clay, and a hand held torch like this:

[clare.ryalls@gmail.com]

Thanks Dennis.