Apologies for getting to this late – Raspberry Pi Big Birthday Weekend jobs have been stacking up, so priorities…
Raspberry Pi has released the STL files and a tutorial that will allow you to 3D-print your own version of the Astro Pi flight case. It’s been split into 4 parts to minimise the amount of scaffolding and, therefore, lowering the print time. More information, the files and the tutorial are available via this post on the RP website.