This is a hose between the quite common B&D DN85 beltsander and an vacuum cleaner with a 35mm pipe.
In case of the heat from the beltsander during working I recommend to use PETG and not PLA.
This hose in combination with a vacuum cleaner replaces the dustbag.
Update: Did some improofements as I realized the hose sits a bit to tight. 1.2 is the new version.
It comes along with the ScetchUp model as well.