Laser printing looks good but the printed pigment can crack or flake off at folds or rub off the paper.
Laser printing sticks best to thinner papers that either have a slightly rough surface the colored thermoplastic (which is what laser printers print with) can grab, or use paper made for use with laser printers. You get better adhesion using the "improve toner fixing" setting. This might curl the paper but that will not matter.
After color printing coat the paper with your favorite fixative, either clear spray coat, floor wax for a glossy look, or acrylic gesso.
After printing the model on 20 to 25 pound paper as above, print the model one more time onto your favorite weight of card stock, using the laser printer's "black and white" and "toner save" or "draught" setting(s).
Also experiment with the scale setting on the printer, and make the card stock print about 97 to 99 percent of the size of the thin paper color sheets.
Build the black and white model, and as you are building it up, color the edges with water colors or markers and then apply cutouts of the color print to the card stock body.
All your mistakes and glue smears will be hidden under the colored skin, any additional glue drips can be wiped off the coated skin. Since the colored laser printed pieces will be cut rather than folded there will be no fold flaking and the protective coating will prevent the laser printing from rubbing off..
For tanks and sci-fi models, print an extra B&W card stock and color sheet and use them to add a layer of thickness to surface greebles.
