After smashing one of the cord pulls between the sash and the frame:
The glittery PETG looks surprisingly good in the sunlight that will eventually change it into dullness. The black flecks come from optical effects in the plastic, not the usual burned PETG snot.
The solid model is basically a hull around two “spheres”, truncated on top & bottom:
The interior has a taper to accommodate the knot, but they’re chunky little gadgets:
I thought the facets came out nicely, even if they’re mostly invisible in the picture.
Each pull should build separately to improve the surface finish, so I arranged five copies in sequence from front to back:
If you’re using an M2, the fans hanging off the front of the filament drive housing might come a bit too close for comfort, so rotate ’em upward and out of the way.
If you remove the interior features and flip ’em upside down, they’d work well in Spiral Vase mode. You’d have to manually drill the top hole, though, because a hole through the model produces two shells.
The OpenSCAD source code as a GitHub Gist: