In the conceptual phase of product development, it is necessary to evaluate several different conceptual solutions, taking into account various criteria, in order to decide on the best one. Ecological impact, which is rarely used as a selection criterion, has become not only a trend in the recent years, but a requirement to enter the market through meeting numerous standards and regulations. A literature review of eco-evaluation methods is conducted in this paper. Very few methods are applicable in the conceptual phase due to the unavailability of data on the entire product life cycle. Although the number of applicable methods is very limited, four methods are selected that can be applied in the conceptual phase, described in detail and carried out on concepts of additive manufacturing devices (3D printers). The obtained results are compared and a review of the advantages and disadvantages of each method is given.