Based on Carrier's strain relief model, with added support for a zip tie "drag chain" to evenly distribute strain and ensure reasonable bend radii.
https://www.printables.com/model/502616-prusa-mk4-cable-support-x-axis
To make sure that your printer's tolerances/settings and the slot's dimensions will work with your zip ties, you can print the test model (~10 minutes and 1g of filament).
The author remixed this model.