Before printing, check if your bottles are magnetic! If not, you can try the upper ring (see photos).

This is a super lightweight straw holder for lubricant sprays like WD-40! It was designed for D4x2mm magnets and straws with an outer diameter of about 2.15mm. Update: I made versions for D5x3 and D6x3 magnets! You should also be able to use them with slightly thinner magnets.

You can print it with standard print settings, just make sure elephant foot compensation is enabled (not default on A1 series!) and print at least 3 at once for cooling. 

It was designed for a press fit, but the diameter of these magnets slightly varies. You might need to use glue if it's too loose. If the magnet doesn't fit, I included build plates with slightly upscaled versions. I tested this print on 3 printers, different filament brands and magnets. I always had success withe either 100% or 101%. Please let me know if none of the versions works or if you needed other settings.