Abstract: In a method of producing an add-on part of a drive, one circuit board of multiple planar circuit boards, which have electrical conductor tracks with electrical connections, is provided with a centrally arranged opening for passage of a shaft. The circuit boards are populated with electrical and/or electronic components, and the populated electrical and/or electronic components and wiring are electrically tested. Segments made of a material with high thermal conductivity are arranged on at least two of the multiple circuit boards such that a bending process in a region of the electrical connections between the at least two circuit boards causes the segments to form an approximately peripherally closed cover. Lids are arranged on open sides of the cover to realize a closed housing arrangement.