$200 for a printer does not break even at 10 sets if the sets are $20 unless the cost per unit printed is $0.
$200 for a printer does not break even at 10 sets if the sets are $20 unless the cost per unit printed is $0.
In the US, it’s common to get quality generic PLA for $15 per kg. Buy several spools at once in a package deal and the price can fall to $11-12 per kg. Wait for a sale and buy a 10-pack and I’ve been getting PLA under $10 per kg. It’s very cheap.
For toys I’d prefer to spend a little more on PLA Pro or Plus, which means it has modifiers added for better impact resistance. This helps a lot with small toys I print for the kids.
You may be looking at more advanced materials like carbon fiber or fiberglass reinforced filament for printing larger parts that take a load/stress.
The fact that the analysis can be carried out in monetary units (because we don't have a good direct measure of utility) doesn't mean that receiving money itself is the only source of utility that needs to be considered.
The commericial overhead rate for an SLA printer is about $5 a plate - the washing and curing steps can be largely automated, or even if they are done manually, it's not that much work.