Yoghurt Drop Mould Mould

This is a mould which is used to cast a silicone mould for making yoghurt drops - in this case, for my daughter's rats. Print the mould (no supports required in the supplied orientation), then fill it to the brim with food-grade casting silicone. We used a 1:1 by volume “self-degassing” two-part casting silicone, which poured really easily and didn't require a vacuum chamber. We used approximately 220g of the mixed silicone, though it's always wise to mix up a little more than you're going to need. Pouring the silicone, make sure that the mould is filled to the very brim, and that all of the ‘bumps’ (which become the hollows for the yoghurt drops) are properly covered. Our silicone was fully-cured and ready to demould after about 8 hours - no mould release agent was needed, and the demoulding is super-satisfying!

To make the yoghurt drops, we made a mix (see recipe below), spread it into the silicone mould using a silicone spatula, and then put it in the freezer for a few hours. At this point the yoghurt drops can be turned out of the mould, which is easily flexible enough to make this straightforward. The ratties do like them cold, but they can melt quite quickly and get messy, so we transferred them to a food dehydrator (on pieces of parchment paper) and dried them overnight, resulting in a somewhat shrunken though reasonably-stable yoghurt drop.

Our recipe so far:

• A third of a cup of plain Greek yoghurt 
• A rounded teaspoon of cornflour/cornstarch
• Three rounded teaspoons of powdered milk
• A teaspoon of honey
• A dessert spoon of rice crispies, crushed (but not to powder)

All ingredients are mixed together well, and smoothed into the mould with a silicone spatula. If you are making the drops for humans, perhaps increase the honey and try omitting the cornstarch (maybe use another teaspoon of powdered milk instead?) The recipe above does seem popular with the rats, as a treat!