I'm recovering a wallet from Armory and the blockchain is taking too much space. My HD is 500 GB big but none of my partitions have more then 70 GB left. The folder
.bitcoin/blocks already uses 37 GB and Armory is only at 52%. Any solution to this?
No, you'll need to make space for a full copy of the blockchain somewhere. AFAIK, Armory rescans the blockchain in order to build its own database only after Bitcoin Core has fully synchronized. Therefore, Armory needs access to a full copy of the blockchain which is currently about 118GiB. Armory's database itself then will take more than 20GiB additionally.
If you are using a BitcoinD server then you can enable pruning which is enabled since v0.12 (with Wallet support - see https://bitcoin.org/en/release/v0.12.0). You can then specify the amount of space you want to allocate for the blockchain data. For instance 550Mb or 5Gb - entirely up to you.