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Using a 3D cutter can pose safety concerns, especially regarding the emission of gases when cutting materials like plastic. Many plastics release harmful fumes when heated or cut, which can be toxic if inhaled. This is particularly important in an environment where adequate ventilation may not be available. Proper safety measures, such as using fume extraction systems, are necessary to mitigate these risks.

While the other options touch on aspects of 3D cutters, they do not directly relate to safety drawbacks. Low power consumption may suggest efficiency rather than a safety concern, ease of operation without training could lead to unsafe practices if users are not familiar with proper handling, and the limitation to soft materials does not address safety directly but instead refers to the capabilities of the cutter. Thus, the emission of gases is a significant and direct safety concern associated with using a 3D cutter.