If milk jugs are acceptable, that’s probably a better option anyway. I don’t think there’s any standard for detergent bottles, so you’d have to make a different version for each type of bottle. At least in my country, milk jugs caps are fairly universal.
Something like this? https://cults3d.com/en/3d-model/various/needle-disposal-system
Actually, yeah. Those look more like milk cartons though which is another acceptable thickness/hardness.
If milk jugs are acceptable, that’s probably a better option anyway. I don’t think there’s any standard for detergent bottles, so you’d have to make a different version for each type of bottle. At least in my country, milk jugs caps are fairly universal.