Is there a holding medium to hold multiple 4mm tubes for soldering

Thank you everyone! Vera, I like the idea of using the plasticine clay & investment. I’m always interested in trying out processes that will give me better results.
My first soldering attempt was with Wolf Clay, with 1/3 success and small cusses. My user error resulted in 2 sections or parts of the “flowing” tubes failing to solder, ("solder does not fill gaps, etc…) but the clay did the job where my tubes sat snuggly to each other. Enough so that I can use titanium clips to complete the process.
I’ve been focusing on a commission piece for now but I’ll post updates to let everyone know how the piece is progressing.
Thanks again everyone for all your suggestions and guidance.

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