Making your own circuit board with the toner transfer process – 5 Methods tested.
13 February 2023
The toner transfer process is a common method used to create printed circuit boards (PCBs) in a DIY setting or small-scale production. The process involves transferring a printed image of a circuit design onto a copper-clad board, which is then etched to remove the unneeded copper and leave the desired circuit pattern.
The process of transferring toner onto a circuit board remains the same, but the methods of achieving it can differ. I conducted a brief search on YouTube and tried the top four methods, as well as creating my own approach.
I utilized the test pattern from here, which posed a challenge for the toner transfer process due to its intricate design with numerous thin lines and small pads. In this experiment, I focused solely on the toner transfer and not the etching process. In general, a successful toner transfer usually ensures that the image will etch successfully as well.
It is essential to have an iron for this process. Additionally, the copper-clad board must be immaculately clean, free from any residue, including fingerprints. The cleanliness of the board is crucial for the success of the transfer, as any impurities can affect the outcome.
The process can only be completed with a toner based printer such as a laser printer. Inkjet printers can not be used.
This toner transfer process uses vinyl wrap as the backing material. The vinyl wrap has a shiny side and a matte side with markings, and cannot be directly fed into the printer due to its tendency to curl and become flimsy. To resolve this issue, the vinyl wrap can be taped onto a regular piece of paper and then fed through the printer.
After printing, remove the vinyl wrap from the paper and place it onto the copper-clad board. Apply heat and pressure to the paper for several minutes, causing the toner to adhere to the copper. The backing paper from the vinyl wrap should then easily peel away.”
By diluting acetone with isopropyl alcohol, the effectiveness of the acetone is reduced, making the toner somewhat sticky and more able to adhere to the copper-clad board.
Do not use acetone that contains any impurities like moisturizer. Most chemist or supermarket purchased acetone contains chemicals other than acetone.
To use this process, clean both the print on the glossy paper and the copper-clad board with isopropyl alcohol. Then, coat the board with the acetone and isopropyl alcohol mixture. Place the print onto the board and after 10 seconds apply pressure on the print. Finally, immerse the board in water, and the paper should peel off, revealing the toner that has adhered to the board
The first step in this process is to apply paint containing acetone onto a copper-clad board. After the board is painted, place a print on vinal backing paper onto it, and gently rub the tracks so that the toner adheres to the paint. Next, soak the board in water to separate the paper from the board.
The next step is to remove the paint that covers the areas without toner, which is where we want to etch. To do this, gently dab the paint with a small amount of isopropyl alcohol using a rag, without rubbing. Avoid using excessive amounts of IPA as it may dissolve the paint layer and disrupt the toner.
If you are succsesfull the toner will be left behind while the paint has been removed.
5. Transparency film
In this procedure, transparency film is utilized to transfer the toner. First, print your design onto the transparency film. Then, use an iron to apply pressure onto the transparency and the board for a few minutes.
Place the board in the fridge to cool. This seems to ensure a better transfer.
Carefully peel the film off the board.
For me the transparecy method had the best result. With a bit of practice all the other methods may work just as well. Check the table below for my notes on each.
The original verson, generally works pretty well when executed correctly.
Vinyl backing paper
Great transfer, make sure your vinyl is not damaged as this will effect the transfer.
I couldn’t really get this to work effectivly.
Great transfer but removing the paint was tricky. Would work well with thick lines.