Could anyone give me some suggestions of how I can make this model stronger?

I'm trying to 3D print this model to act as packaging for plants in delivery. The two halves of the packaging will slide over the pot and connect together, keeping the plant held firmly in place in the bottom half of the packaging, while leaving room for foliage at the top.

The problem is that I can't make a model strong enough. The base of the model that rest against the hotbed is very strong and hard for me to snap. But the arms that extend from the base are very weak and snap with little effort.

I'm using ASA filament, which is very strong and flexible. I also have polycarbonate if that would be a better choice. I'm using a Rostock Max V3 3D printer.

I tried putting support for the arms on the model, but that only made the arms snap where the supports ended.

Here is the link of the images for your reference. https://www.dropbox.com/sh/ae0wxrttf...eNJ2aLMza?dl=0

you forgot to attach pictures :-)
Sounds like a print orientation issue to me. But would be good to see the model.

Again, without pictures it's very difficult to answer the question. But My initial reaction is you should print a master piece, and then vacuform clones of it. Cheaper and faster, especially since you are making disposable shipping packaging.