Belt Tensioner for XY Axis on the Stock Creality Ender 3 Printer.
For the Puller you can use a M5x30mm Screw.
What need to be Printer:
For the Prints i used the following settings:
Filament: ASA
Layerheight: 0.2mm
Walls: 1.2mm
Infill: 40%
The author hasn't provided the model origin yet.