If you instead of laser cutting or jig sawing my original toy horse design, want to print it on your 3D printer, here is a printable version. 

It fits on a 300x300mm print bed (minimum is about 295x295) if you rotate it right, and it uses a 24/25mm or 1" round dowel/broom shaft.

Print the two sides and assemble with glue.

It has a cutout to glue in a mane made out of yarn, which is what I personally prefer, just use hot glue and add some yarn, and because of that, it needs a bit of support on each side.

The slot can also be used to glue in the printable mane which I recommend printing in a soft TPU. The printable mane also fits on a 300x300mm print bed.

I deliberately left out any facial features of the horse, to let you paint it as you like, make it unique and add individuality to each horse.