Now, there is an actual legitimate concern in the notes about the increase of plastic waste that this would create. And, though it should be kept in mind that individual plastic use still pales in comparison to industrial plastic use, this is a real issue in the 3D printing world.
However, increased accessibility of 3d tech, especially to people outside of the "tech bro" world, who are generally less concerned with ecological issues than other groups, is not only not an impediment to improving this, I feel it's necessary to it.
The most common filament, PLA, is plant based and intended to be renewable and even biodegradable. Now, in practice this rarely holds up due to fillers and additives, but the core concept of an "Earth friendly" filament is there. Increasing accessibility and knowledge about this technology, especially among groups like mothers, who generally care a lot about ecological issues, raises the demand for products that follow through on the promises of PLA as a concept.
It's not just about the fact that these people deserve this and the fact it will improve the works and learning material in this field, but it also forces a shift in the market to accommodate the demands of the growing demographic.
Of course, "vote with your dollar" only goes so far and real change needs to be made in the regulations and standards of plastic production as a whole, but my point is that keeping this tech out of the hands of the common person doesn't fix or even really delay the harmful effects of plastic waste created by the tech itself, and making it more available may even expedite the process of improving it.