Toner transfer for PCBs

Last Thursday I read on Dangerous Prototypes forum about doing making PCBs by printing on vinyl and heat transferring to PC board, then etching. Vinyl was reported to transfer 100% of the toner easily, better than the sheets designed for the purpose. Since I was in need of a board, Andrew had recently gotten some vinyl at the space, and there’s a laminating machine there, it seemed worth a try.
The process is simple: laser print the circuit on some vinyl sheet that’s glued to a piece of paper, then run both the printed piece and a blank board through the laminator to transfer the toner to the copper. Paul Reich just finished a circuit board design that looked pretty challenging to etch, so that seemed a good test.
Initially I worried that putting the vinyl through the laser printer might be a little risky. Running a few small patches through didn’t show any obvious issues. The vinyl for the vinyl cutter isn’t ideal: it could be a little thinner and it’s nearly opaque so it’s hard to see whether the image is on the board.
The first quick test was quite encouraging.

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Although far from perfect, in the areas that transferred the detail was quite good. Since the board hadn’t been cleaned and the board was only run through the laminator once, results were better than expected.
Saturday back at the space, I thought to try some other materials instead of borrowing the supplies for the vinyl cutter, and try some ways of cleaning the copper. Browsing the hardware turned up some Con-Tact low-tack shelf paper that seemed to be vinyl, as well as steel wool and polishing compound to clean the copper.
The shelf paper didn’t work out, as it didn’t stick to paper enough to go through the printer. Steel wool and polishing compound both appeared to clean the copper pretty well.
After some further experiments, Paul and were able to make a couple of double sided boards that were good enough to use for some of the tests we were hoping for.

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Printed Circuit Board class!

Minty Boost XL by Robert Hunt

Minty Boost XL by Robert Hunt @flickr

Jim is going to be running our Printed Circuit Board class again. Last time this class was offered it was really well received by those in attendance. This class will cover a variety of etching techniques. If you have any small circuits for which a PCB would be appropriate, let Jim Williams know right away. We might be able to add your boards to the class!

When: March 27, 6:30 – 8:30 pm

Where: Workshop 88 in Glen Ellyn, IL

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Printed Circuit Boards class (July 2011)

Minty Boost XL by Robert Hunt

Minty Boost XL by Robert Hunt @flickr

Jim is going to be running our Printed Circuit Board class again. Last time this class was offered it was really well received by those in attendance. There will also be small W88 logo key fobs as a giveaway for attendees. If you have any small circuits for which a PCB would be appropriate, let Jim Williams know right away. We might be able to add your boards to the class!

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