I have to say this board we made is more or less useless, because we make it for demo, and we forgot double check the traces after we use laminator to transfer the toner, so some traces may in error.
What all you need is:
Laminator machine can reach 200 degree
Etch solution (Available from Electrodragon)
Toner transfer paper (Available from Electrodragon)
* Sand Paper 1000 and 600
Copper Board 10*15 (Available from Electrodragon)
* Printer and A4 paper
Oil marker pen
For the toner transfer paper, you sell it in a roll, please unroll it by flatting with some heavy materials.
All photos took by cell phone, sorry for the bad quality.
Step 1: 1. Print on the white paper
Print your board file directly on the white paper, we use nanino project, which is very suitable for making home-made arduino. See below.