Firstly, you say “the factory”, which site/service?
The general rule is, if they don’t say, you can’t.
A right has to be bestowed upon others for it to be used.
Chances are it does say, yet you didn’t look thoroughly or understood the words they used.
Share the link and we can help you determine.
If they do explicitly provide this right, it would be a remix as you used their work to add your own.
It obviously isn’t your work as it is a combination of their greater effort (they came up with the source model) with yours added. It is likely the addition you made will serve you, but not be shareable with the wider community.