Saw this on tube. To print out a tooling pattern and print it on tracing paper at the same time to reduce a step;
Use rubber cement or a light holding glue and attach the printer paper to the tracing paper for support, I suppose you could use heavy card stock as long as your printer will handle it but both pieces must be the same size or trimmed. Then print ON THE TRACING paper your pattern, separate the 2 papers and transfer your pattern to your cased leather the usual way with a stylus.