Bộ căng dây Neptune cải tiến

Want a better backup for your tensioner in case it breaks?
Too tired of belt rubbing on the ends of extrusions?
Still not tense enough at the end of the movement range?
Or just simply needing an upgrade

This tensioner does it all, being carefully designed to shove as much material into the part, enhancing strenth, it aligns better with the rails on the stock cover, have more tension range, and it uses a proper toothed idler!

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Features:
- Reduces belt rubbing
- Remove potential print artifacts
- Automatically align better
- More adjustment range
- Built sturdier than stock
- Suitable for the neptune 3 and 4 lineup (Excluding 4 Pro!)
- Gates have better bearings allowing for higher tensions and lifespan

NOTE:
- Put the belt over the idler before putting it in
- Does not work for the n4Pro!
- Dowels/pins may come oversized for the bearing, sandpaper and elbow grease is your friend
- To get good pin OD dimension, I recommend ejection pins (does not come cut to length)

Recommended print settings:
- Walls/perimeters: atleast 2.4mm
- Tolerance requirement: 0.2mm
- Print orientation: as imported
- Supports: none

Recommended materials:
 - PETG
 - ABS/ASA
 - Any low-creep plastic

Installation requires:

Name

Qty 

Recommended source

M3 * 25mm BHCS

1

5mm * 20mm SS Dowel pins

1

(Option 1) Chinese spec idler

1

AliExpress(Affiliated) (20T W6 B5 With T)

(Option 2) Gates spec idler

1

Mellow(Affiliated) (7mm with T)

(Note: 
Buy here (20T W6 B5 With T) - 1 * 4 x 18 x 8.5 GT2 toothed idler (check image)

Installation guide:

Changelog:

Official release

Changes

v6

3rd November 2024

first official release

v7

6th November 2024

removed heatset insert

v10

13th March 2025

Added Gates spec tensioner

Changed Chinese spec tensioner to use pins