Resin is not as toxic as most people think. The main danger of it is allergy that you can develop over time unnoticed, irritation of skin and eyes and waste product problems for the environment (only if uncured!). The ingestion of uncured resin is a very silly type of risk - tide pods are toxic too, toilet cleaner is deadly when ingested etc.

The safety inventions (ventilation solutions, leading fumes outside the home directly, pre-filled resin pods etc.) are yet to come, it’s still new territory. Non-toxic cleaning agents and UV-resins are being developed right now, too.

And there might be other materials we could use, paper or other safe organic materials like wood pulp for example one day.

I am all for nanites, but let’s not write off the printers yet.