"Cliff H" wrote in :

I have heard of this,

I have actually done this, and I already responded to the OP telling him what he needs to do
to make it work, with comments based on my actual experience, rather than uninformed and
erroneous guesswork.

but you need to figure out how to turn up the darkness
of the laser printer to put the max amount of toner on the paper.

No you don't.

Print it reverse, which you can probably setup in the printer driver,

The "Reverse Printing" setting tells the printer driver to print the pages in reverse order. To
reverse the image on the page, you'll need some sort of graphics software.

turn it upside down on the wood.

OK, *that* part you did get right.

You will probably have to experment on how much heat to use but I would
think pretty high.

As I noted in my first post in this thread, the iron should be set on its highest setting.