Quantity   Component name
1 × Mooni Bluetooth Button a bluetooth remote shutter button for a cell phone camera
1 × an old cell phone high end phones have better cameras and more memory
1 × charger and cable for the cell phone to power the phone during long prints
1 × Bracket to mount the phone on or near your 3D printer. You can use tape, velcro, suction cups, magnets, a tripod, whatever works for your phone and printer and will be stable for the duration of the print.