Combat Robot for Spaceship Marine Roleplay Game 1.0

This robot is intended to be 25 mm tall and printed in quantity for a game called Spaceship Marine, designed by a neighbor of my Friend Ixmal in London.  I have decided to take on the task of making game pieces for them on my Ultmaker.  

The main photo shows a 2.25 times (larger print) model, with Cura generated supports and while removing the support, both of the arms snapped.  So obviously I need to beef up the arms, and also I wonder if the support is too hefty for small models.  I am left with one question though - does the sturdiness of the support vary with print size?  I'm thinking that I need to adjust some parameters to tone it down?  I'm going to try using my own supports next.  

Les