This is a remix of T1miverse's design
https://www.thingiverse.com/thing:2964580
NOTE: Outdated version!! Find the latest version here:
https://www.prusaprinters.org/prints/100314-v2-of-angled-heatbed-cable-cover-remix
ALSO NOTE: Recommended upgrade for LACK enclosure!
After making changes to my extruder assembly I noticed my hotend cables getting pretty close to screws sticking out of heatbed cable cover.
Therefore I remixed original design (increased height slightly) so that top surface is now perfectly smooth and nothing can collide there.
Assembly notes
I recommend to remove red plastic protection of heatbed cables and wrap them again with insulating tape. It helps with bending cables into the cover. Bend is still quite sharp but you won't wreck the cables as you normally would without this procedure.
For middle main screw holding onto the heatbed (marked with red circle on 3rd pic), use 3 M3 washers from the bottom side to offset M3x10 screw slightly.
I suspect that M3x8 screw would be too short. However, it might work with original unremixed files.
The author hasn't provided the model origin yet.