Labelling the keycaps of our 4th generation prototype was like many other: it's critical to know about the right technology for the job. After talking to a super-knowledgable guy it was a matter of sending over some files to a company, spending some hard-earned cash and waiting a little while. Then András had to precisely position the labels and transfer them to the blank keycaps which he did marvelously.
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Just to avoid any misunderstanding, a blank version is planned so fear not!