I have been seeking spares, like Supernova kit - yet they seem permanently unavailable. What is likely timescales - or will it never reappear?
On a separate note, my float sounds like it has water inside - is there a way to resurrect it without a replacement?
TIA
Hello
Currently, the Supernova - Smart Garden 9 Upgrade Kit is out of stock in EU. Unfortunately, it is not known at the moment if or when it will be available. You can check in with the store, so that you will be notified if it is available for sale.
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Thanks for letting us know you are missing it!** 
And for the float full of water can be opened and emptied
Look at the guide here, the part of Float filled with water: https://support.clickandgrow.com/hc/en-us/articles/202848546-How-to-avoid-overwatering
As the lights are still available in the store, if there is no intention to produce more of the 3D printer components please could you publish the STL files to allow for local production?