> The standard defense for something like this is "the plugin is a separate work, so it's not subject to copyleft." That argument falls apart on contact with the actual software. BS cannot do its primary job without the plugin. The plugin cannot do anything without BS.

But that's just not true? You can connect a printer in LAN/dev mode and print directly from slicer to printer. There are apparently some issues with more complex network setups but that seems to be the exception rather than the rule.

I think the concerns he has generally are valid, but I have yet to see something from a legal perspective (e.g. precedent) that convinces me this constitutes a license violation. Would love to see one.