I have done organza flowers and butterflies on my embroidery machine. I use a stencil cutter with a fine point to melt the organza. One thing I noticed was that you really need to keep the stencil cutter moving constantly. If you stop it will leave a burn mark and a rather sharp edge to it. I used rayon thread for my projects and had no trouble with it melting the thread at all. I do know other embroiderers also used a wood burning tool with success. I HTH.

Thank you all. I am now inspired and off to have a go.

J.