Couple of points first:
I designed this because I’m making a CNC plasma table so I wanted large drag chain. If you’re doing a normal LowRider v3 you may likely be able to simply use your vac hose as your cord constraint, or if not you probably can use smaller drag chain than this.
Second, injection molded drag chain is definitely better and I would spring for it if I was not at the limit of my budget. So for me this is an acceptable work around. That said….
Free STL download: Printables
July 30, 2022: posted tweaked version of both chain link and snap-on clip, to strengthen the clip’s grip on the chain link.
August 4, 2022: provided additional choices so that the fronts and backs can have wires/cords exit “above” or “below.” Renamed design to version 1.12. All added new parts are compatible with the previous versions of this design.