I suggest this combo:
-Screw Clamp.stl (Hex or not, your choice)
-Insert1mm8.5mm.stl
-Clamp Nut3.5mm.stl (Hex or not, your choice)
(The original was "Insert1mm8.2mm"-"Clamp Nut1.5mm")
STEP OR SOLIDWORKS FILES: https://www.thingiverse.com/thing:4711781
This tapered thread bowden coupling is made to improve the original one (made in brass with weak grip) by putting a case on it.
The M6 thread can be tightened really good.
This is my second version. This thing was made with Solidworks which mean you can modify it or request a modification!
First version: https://www.thingiverse.com/thing:3592750
Imported from: https://www.thingiverse.com/thing:3837897
Inspiration: https://www.thingiverse.com/thing:1993384
Edit (V2.1) 2019-11-25:
Made some tolerance for the "Insert","Screw Clamp" and the "Clamp Nut" based on the reviews of Haazaboge; Bubble_Guy; jhillyerd; gromi. Thanks for the comments, it really help!
Printer Brand:
Creality
Printer:
Ender 3
Supports:
Yes
Resolution:
0.12
Infill:
50%-75%
The author marked this model as their own original creation. Imported from Thingiverse.