Depending on how much you are going to be printing and what you're going to be printing, filament prices are definitely important i will focus more on the electricity costs as this is more of a common cost/worry for potential 3d printers.
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Fdm is the cheapest technology among the three listed, and sls is the most expensive one. The majority of 3d printing materials can thermoplastics are rigid, widely used materials that must be melted prior to extrusion. And it already is becoming more affordable and accessible.
Furthermore, when it comes to really maintaining when issues really go bad, it is more likely that i will buy another printer rather than fix it because the technology is still so much in flux that.
We need to make 3d printers a lot more affordable and too expensive? These are usually made of metals to help support the weight of mass production. Swapping between the three heads and beds does take time to reconfigure and calibrate for the prince and features it's worth it. For instance, i use a printrbot metal simple personal printer.