Hi,

They are an off the shelf paper cup which we source from various suppliers.  You should be able to find a range of different sized cups from any catering supplier.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

You don't have to use a cup if they don't fit, could also just line it with some vacuum bag or plastic bag or cling film, or anything like that...

Thanks for the responses guys, I was after a more repeatable, process-friendly solution though. 

As long as the cup fits you will be fine.

Plan your resin feed and distribution to help avoid wastage.  Also leave a gap between the part and the vacuum feed mesh.  It helps slow down resin flow to the catchpot.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant