Depending on the orthotic, they can be expensive. 3D printing can be a cost-effective alternative. 3D printing is an additive manufacturing process where filament is layered on top of itself to create a three-dimensional object. This differs from more traditional subtractive manufacturing processes, like drilling, where the material is taken away to form a whole. Free online versions of different orthotics are available to print if a more general model is suitable; they can also be adapted to fit the owner and pet's needs. Libraries may be a source of complimentary or donation-based printing for the public. Custom orthotics can also be designed in 3D modeling software. See also Veterinary medicine Meadow (calf) References Veterinary equipment