Model application study
A repeatable cable carrier for a guided machine axis
A close look at the clearances, pin geometry and print compromises behind a snap-together PETG cable-carrier link.
The application
Moving wiring needs a predictable bend path, but a complete commercial drag chain can be excessive for a small guided mechanism. A repeatable printed link offers a configurable route when the run is supported along its travel.
Constraints
- Each link needs to snap onto the next while leaving enough room for the joint to pivot.
- The 14mm cable channel and top bar must print without trapped support material.
- The design must be described as a guided carrier, not a self-supporting industrial drag chain.
Process
01
Set the repeating pitch
Each 18mm-tall frame advances the chain by 22mm and leaves a 14mm channel for the cable bundle.
02
Tune the joint
The rear fork steps over the next link with 0.3mm clearance per side; 4mm pins run in teardrop sockets with 0.35mm radial clearance.
03
Accept the right compromise
Horizontal pins leave a small unsupported lower quadrant. The teardrop socket protects the useful bearing area without adding inaccessible support.
Design outcome
The catalogue model produces one repeatable link that can be multiplied to suit the run. It intentionally bends both ways and has no straight-run shoulder, so the application needs external guidance.
- Link pitch
- 22mm
- Cable channel
- 14mm
- Pin diameter
- 4mm
- Example quantity
- 12 repeat links