You can find tons of stuff by Googling "tampographic printing". Several companies in the UK. A very neat process. The machines are fairly small and air driven. I understand Professor Motor(Andy Smith) is planning to manufacture their own cars and bodies. I can't wait to design my own. I will be seeing him this week so I may have more details. He told me he can buy the machines for about $1500US, so they are probably a better deal over there (strong pound).
I used to own a company that specialised in making small pewter castings (cufflinks, badges, buckles, etc.) and we used this method for printing. You may remember the range of coloured 3D cufflinks, Wallace and Grommit, teddy bears, etc. We made all of them. This is where we got involved in tampo printing.
Basically you have a plastic or metal (for high quantities) plate with the image to be printed lightly etched into the surface. The plate is flooded with ink and scraped off with a blade, leaving the ink in the recess. A soft silicone pad is pressed down on the plate and picks up the ink. The pad is then pressed down on the product leaving the ink. The process is then repeated. From a DIY point of view it is not very practical but could be done by hand. The etching is done by acid on metal plates and ultra violet light on the plastic ones. I can explain either if you are interested. I think printing decals is much more practical for us.
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