<p>I'm struggling to find out an enclosed 3D printer that allow to load the common 1 kg filament bobbins. Most of the enclosed ones accept only proprietary bobbins (like Dremel or Flashforge).</p>
<p>Do these bobbins ( = 1 kg) rely on a specific standard I can search for?
How to filter out the printers that match my request when making a Google search?</p>
<p>I'm aware I can &quot;easily&quot; put them out of the machine using a custom support (or even directly in a dryer as I do for my Dremel) but this partially nullifies the advantage of the enclosure.</p>

QIDI Tech makes a series of enclosed printers, which would narrow your search a bit. I own an X-Max model which has an internal spool spindle as standard equipment, along with an "ordinary" external mount. The internal spindle will take a standard one kilogram spool. It's considered good practice when printing moisture sensitive filament such as nylon to have such an environment.
With respect to search terms, it's fairly difficult to identify a phrase that would collect the information you require.