Ethernet Cable Reel - RJ45 Extension Spool

Turn a spare SUNLU filament spool into a clean, functional ethernet extension reel - just like those retractable extension cord reels, but for CAT5/6 cable.

A dedicated hole in the spool hub accepts a standard RJ45 keystone connector (the pass-through type commonly found on AliExpress).

Assembly uses hardware, not friction:

• M3 × 12mm screws
• M3 × 4 × 5mm heat-set inserts

This means the two spool halves open and close reliably every time - no fighting with tight friction fits. Of course it's possible to do it without inserts and screws. 

 

Drill template included: A dedicated template guides an 8mm drill bit to create the dowel holes in both connector plates, so the spool spins freely on the stand.

The road to get here: This didn't come together on the first try. Several prototypes came before this release - each one teaching a lesson about tolerances, connector fitment, spool alignment, and how to make assembly actually enjoyable rather than a battle. The insert-and-screw approach in particular went through a few iterations before landing in its current form. Every failed print was worth it.

Print files included:

• Left side
• Right side
• RJ45 connector mount
• Handle connector
• Handle
• Drill template

Hardware required:

• M3 × 12mm screws (x3)
• M3 × 4 × 5mm heat-set inserts (×3)
• 1× SUNLU filament spool (empty) (see image below)
• RJ45 keystone connector (example: https://www.aliexpress.com/item/1005010685008464.html)
• 8mm drill bit

The support SUNLU spool

Put the drill template on the spool and drill a hole. Preferred where the sticker is, since you have more space.

Currently designed around the SUNLU spool and tested on Bambu Lab P2S. I printed this with the aux fan off.

A1 Mini support, compatibility with other spool brands, and a fully self-contained version (no upcycled spool required) are all being explored.

Use of AI

I use AI to help write and rephrase parts of the description. The content is generated with my input and reviewed by me to ensure it accurately represents the product, as English is not my native language.