Cut your bottle very slowly while keeping the strip in line, the beginning of the cut is often brittle if you do not cut the bottle properly before using the tool. 

Set your slicer with the following settings to drastically improve print quality:

Nozzle temperature = 260°C
Bed temperature = 70-80°C
Fan = 50%
Layer height = 0.15
Flow = 130%
Print speed = 25 mm/s (it is important to print at a very low speed otherwise irregularities will be very serious and can damage the printed part!)

You can print in practically any durable filament, PETG, PLA etc

Print settings

• Supports: non
• Resolution: 0.15 to 0.4
• Infill: 40% to 100%
• Color: Any
• Filament material: PET, PETG,PLA
• Printer brand: Anycubic kobra neo