I bought a belt sander from Harbor Freight Tools that came with a small dust bag collector. I thought it would be much better to have my Shopvac collect the dust rather than this bag. This is an adapter for the sander and a 33 mm diameter flexible Shopvac hose. I have uploaded the adapter as two separate parts so it can be modified for different size hoses. My ShopVac and hoses are very old, so newer models might have different hose diameters. I'm using a smaller hose and adapter to the main Shopvac opening. These are/were standard Shopvac parts.
I'm using a PrintrBot Play. It's not listed in the drop down menu.
The individual pieces took just over 1 hour. The combined on over 4 hours.
Temp: 192 degrees
Use E6000 glue if you printed the parts separately.
Might need to remove the odd burr on the side of the connector as it' s not strictly round.
I measured the existing connector on the Belt sander and modeled this in Tinkercad. I made sure that this part (DC_connector.stl) fit before moving on to the ShopVac hose. I'm using a small nozzle flexible hose for hand held power tools. The diameter of the pipe is about 33mm. Once I had that piece correct ( DC-adapter.stl) I glued the two together. I found the "connector" was a bit weak and broke along one edge so I made it beefier. I also found that the adapter was a little small in terms of length. Only a small part of the shopvac hose was connecting. So I made that deeper/longer as well. Once happy with both pieces I went back into Tinkercad and joined them together and adding more material to the connector. Also this last design can be printed without supports. The DC_connector.stl should be printed with supports to make sure the channel overhang works. The support was easily cleaned out. Or you could try printing it vertically if you you have good first layer adhesion on your printer.
I have uploaded the individual parts in case you want to use a different diameter shopvac hose.
Belt Sander Model
These parts were designed for a Harbor Freight 3 x 21 belt sander.