Adapters that allow you to easily and accurately dose aquarium conditioners and fertilisers straight from the bottle with a syringe. I used the original model as a base to create a more “universal” shape that should be scalable to fit most, if not all, bottles. So far, I've printed and tested adapters for 100ml Seachem and 250ml Easy-Life bottles and am planning to do more later as the need arises. The adapters sit flush and allow the cap to be closed all the way.

PRINT IN A FLEXIBLE FILAMENT. I used PrimaCreator EasyPrint FLEX TPU with shore hardness of 95A. Diameter of the included syringe hole is 4mm, it fits the syringes that I use but I'm not familiar with syringe sizes so it might fit many different kinds or it might not. That's why I also added a file without a hole for each adapter so you can add one of the correct size in your slicer.