A third point to take into consideration is plastic waste. When the world is trying to reduce the use of plastic materials, 3D printing seems counterintuitive in terms of "green" materials. However, besides the green benefit of 3D printing in general compared to the industry standard, e.g. printing only one piece, printing in the place of use, no need for shipping, and so on, green(er) materials have started appearing on the market. Recycled PETG or PLA is currently available from many different vendors, and researchers are working on upcycling 3D printable plastics.[114] However, we can do better than just using recycled materials. For example, support material should be avoided as much as possible. The support material is plastic material that supports the printed parts while printing, and it will be thrown away as soon as the print finishes, so when possible, care should be taken in the design of the object to be printable without the use of any support material. A similar objection can be made for multicolor or multimaterial printers, where most of the material is purged out in "color towers". Once again, it is waste material and should be avoided as much as possible. Plastic waste from 3D printing is only a drop in the ocean, and it is an infinitesimal part of worldwide plastic waste. However, a discussion on the topic and how to avoid unnecessary waste or minimize it is essential for an ethical research environment. I hope I managed to convince you about the usefulness of a 3D printer in the lab. This short review focused only on FDM printers because I believe this is the first step in 3D printing and is the most versatile one. Sooner or later, you will encounter Stereolithography (SLA) or masked Stereolithography (m)SLA printers. They use a mixture of methacrylates and a photopolymerization reaction to manufacture a 3D object. If a student asks for these kinds of printers, buy them, they probably know more than you (and me, for what it is worth).