Modified the mounting plate from @pablogk95 for the hotbed to fit my preferred y-axis cable chain. I've ordered a 10 x 10 mm one which has slightly different screwholes.
Amazon US: https://goo.gl/EuhEQm
Amazon DE: https://goo.gl/uS8T6s
Note: The chain is rather stiff. You should overbend it a little bit so it runs smoothly. Remove the cable sleeve carefully and attach only a small piece at the opening hole.
UPDATE 1 (2017-12-01):
Added a modified cable chain frame and fixed the screwholes so they match the i3 base. You need to trim the endmount on the cable chain so the cable can fit through. The chain is attached with short M3 screws.