This clamp comes in 3 sizes and with the largest model holding 7 cables, with each cable having a maximum diameter of 6,8 mm. The two parts are screwed and held together by M4x10 mm screws.
I printed mine out of eSUN PETG HS and 0.12 mm layer height.

NOTE: The largest clamp requires 2x M4X10 screws and 2x M4 hex nuts!
NOTE: The medium and small sized clamps only use 1x M4X10 screw and 1x M4 hex nut!