I needed solid holder for two cables with absolute sure they are separated. I needed it to work with screw, so it works with any M3 screw (there is a place to hide screw head if you uses flathead screw). 

• About 8min and 1g of filament
• Supports cables up to 4mm in diameter
• Dimensions: L/W/H 20/8/6mm
• You can use support, but it is not necessary
• I strongly advise 100% infill