An expandable RC jump. the dove tails have a small amount of play for fitment. i designed .4mm tolerance to allow for material expansion and contraction. Once on the surface you will be bashing/racing on they stay together very well. the photo's show multiple colors, as i photographed the prototypes. there are some surface imperfections because i did not dry the PETG that i used, but it does not impact the usability of the models. 2 wall layers with adaptive cubic infill at 10% is what i used with PETG, but any material should work using whatever settings you want to use for strength.