A very simple cable holder for the RoBo3D.
Use a M3 screw and bolt to hold it in place behind the X axis motor.
You might have to drill open the hole behind the motor.
V2.1:
I had some problems with homing the Z axis as the whole Z carriage got stuck before hitting the end stop and unscrewed the bolts underneath it.
Version 2 has an open bottom to let the cable hang out further up and is a little tighter so you don't have to use cable ties to keep it secured.
The orange part in the pictures is version 2 and the blue is version 1.
The author marked this model as their own original creation. Imported from Thingiverse.