An electronic pen includes a pen body having a longitudinal axis; an image sensor; an ink cartridge replaceably received in the pen body, the ink cartridge having a nib at a first end and an opposite second end; and a force sensor assembly engaged with the second end of the ink cartridge. The force sensor assembly is configured for sensing a nib force transmitted longitudinally axially through the ink cartridge. The pen body includes a removable cover molding extending longitudinally along the pen body for insertion of the ink cartridge inside the pen body.