I use an iSi whipped cream dispenser to make things besides whipped cream, such as microwaved chocolate cake, or coffee foam to top desserts. Pouring cream or sugar into the small opening at the top is easy. Pouring things like cake batter or coffee in gel form is not as easy. I tried using a funnel, but it just got clogged and made a mess. The best technique I've found so far is to fold some parchment paper in half to create a channel, and have a helper hold it while I pour the mixture onto it.
Does anyone have a better technique for this?