DeWalt Airlock to 35mm adapter

When I went to hook up my DeWalt DCV584L vac to my Festool guide rail plunge saw, I found that the standard airlock adapter terminates in a 32mm spigot, which just rattles around in the 35mm port on the saw. Now DeWalt do a 35mm airlock adapter, but I didn't want to wait and it's hardly a super cheap part at £16.

I figured that I probably wasn't going to be the last person to ever want to hook up these two types of machines, so here is the STL for the part.