This is my first draft at a printable frame for a wheeled cart for a disabled puppy.

Problems I'm running into:

• I printed the draft in low quality, so I don't know how much of the structural problems have to do with the low quality, and how much is design flaw. (The rounded bar where the dog's legs can rest, connecting both halves of the cart are particularly flimsy.)
• The framing is 1 cm in width, which will have to be widened at least where the wheel axles go, if not around the entire frame.
• The cart is not adjustable, and is almost at the maximum size for printing. In order to make the frame work for the puppy as it grows larger, I will need to be able to create smaller, assemble-able parts to be printed individually.

I am designing using SketchUp. I am incorporating inline skate wheels, and for now I'm using a model dog, because the puppies who need the carts are at someone else's house.