Comparative Test: Color Lasers up to 700 Euros: Lots of dust inside the Samsung
Inside the CLP-610ND lots of toner powder accumulates right in front of the fuser unit, and that is also close to the paper output. It settles on metal and plastic battens.
The picture below shows the topmost imaging drum, belonging to the black toner cartridge. Above that is a metal and plastik batten. The orange cylinder belongs to the fuser unit.
Metal and plastic are heavily coated with toner powder.
Samsung´s toner blower
Samsung seems to know of this problem. As a countermeasure the company has added a tiny "cleaning pump", which is supposed to blow toner off the imaging drums´surfaces.