By directly combining keyboard fields with printed circuit boards, you can easily do without a carrier board. The thickness of the material of the printed circuit board (FR4 and others) is chosen here so as to provide stability comparable to the stability of the metal carrier board. The installation of a threaded rod is possible, as well as cutting through holes or backing with a mill. Then, a decorative layer is created on the front side, just like on a regular keyboard. With this design, we are able to achieve significant cost reductions for our customers.