Here is my version of the 90 degree heatbed cable cover for the original Prusa i3 MK3. I recently received it (and its wonderful), and I put it inside my IKEA Lack case (I previously made thanks to Prusa who published a very good tutorial on how to build it (https://www.prusaprinters.org/cheap-simple-3d-printer-enclosure/)). As noted in the tutorial, the cable cover must be changed for the printer to fit properly into the enclosure. However, models that I could find on the internet require soldered wires (on the heated bed) or bend connectors when you have the screwed version. Having received the latest version of the printer (with the wires screwed onto the heated bed) and not wanting to risk damaging them, I designed my own cable cover. It works very nicely! :-)
I hope you will like it!
P.S. If you like the design, please consider a small tip. It would help me buy PLA to test my designs :-)