I found that cleaning in corners was difficult for me with the included attachments/ends. So I created this. "small" file is 32mm on the large side (one of the standard Shop Vac sizes) and 12mm on the small side. After printing this I noticed that just scaling the output was not a good idea because this model gets pretty thin at the tip. To fix that, i created the 'small-fixed tip' file.This one goes from 2mm think down to only 1.7mm. It is still 32mm ID to 12mm ID (inside diameter). Photos a of the first revision. I still need to print the new 'fixed' one.