What do you have on the inside of your prints? (Looking at the one pic of the inside of the bicep)
I saw a tiny bit of layer separation on the bicep and it was concerning, I dont want this thing to split during use. I made a ABS glue slurry out of leftover ABS (same green filament used in the bicep) and acetone. Since the acetone dissolves ABS, it literally melts the layers together when its applied directly to the print. Once the acetone evaporates, the glue turns into a very hard and durable sheet/coating of ABS plastic. This should solve any potential layer separation issues.