Mar 9, 2020 · As for track aprons, with current 3D printing technology they are always going to be expensive, even if you print them yourself. The cheapest PET filament goes for about US$18 per kilogram. mpare that to being able to buy a 4 x 8 foot sheet of MDF for about US$20. The raw material is much cheaper, but you do have to input a good bit of labor.