The original cable bracket broke recently, I made as close of a replica as I could. It uses the original screw and elastic string, the string is a little tricky to untie but can be done. It's easier to install the string before putting the screw in so you don't have to worry about slack. The STEP file and onshape link are available if you need to make any changes. 

Recommended Settings:

• High temp material (ABS/ASA/Etc.)

• 5 walls

• 5 top and bottom layers

• 20% gyroid infill

• Disable single perimeter on bottom and top surface

• Organic support from buildplate only on necessary overhangs (use support painting smart fill)

• 0.15 mm top Z support distance (0.2 mm may lead to poor tolerance with the screw area)

Onshape link:

https://cad.onshape.com/documents/41f78c219c14ae4f9c78bb4d/w/fb93cfca30da181d36f1069f/e/714977f7f30be554fc74d987?renderMode=0&uiState=69b333e85158621d66cbea2a