Here is the complete hardware kit needed if you are 3D printing your own Bosch Dust Collection Chute purchased from Shop Nation. The model of saw you select will dictate the specific contents.
The kit includes:
(2x) Flexible Flaps
(2x) Red anodized knurled M4 thumb screws
(2x) M4 threaded inserts
(5x) Phillips Pan-Head Flap Screws
(1x) Flexible Expanding Hose Segment (not needed for EU Model GCM12GDL)
(2x) Zip Ties
Caution: Do not over-tighten the threaded inserts when installing into the 3D printed chute, you can crack it! Gently work it in by tightening/loosening quickly in small increments to actually heat up the insert as it's installed.