Once you have your goals in mind, you can start estimating your costs for 3D printing projects. There are three main categories of costs to consider: fixed costs, variable costs, and hidden costs. Fixed costs are the ones that do not change with the number or size of your prints, such as the price of your 3D printer, the maintenance and repair costs, and the electricity bills. Variable costs are the ones that depend on the amount and type of material you use, such as the filament, resin, or powder. Hidden costs are the ones that are not directly related to 3D printing, but can affect your budget, such as the design software, the post-processing tools, and the shipping and packaging costs.