A few years back they raided a German host of the Riseup email service due to some alleged online threat [0]
They didn't just stop there, they also moved on to the nearby CCC maker space, for which they didn't even have a permit, and also raided that.
Among the things they found there was 3D printers, chemicals to feed said 3D printer, and a small 3D printed model of the Hiroshima nuclear bomb.
They confiscated all of that under the suspected offense of "trying to create an explosive device" [1]
Can't make this stuff up, reality is stranger than fiction.
[0] https://www.golem.de/news/zwiebelfreunde-polizei-durchsucht-...
[1] https://www.spiegel.de/netzwelt/web/hausdurchsuchungen-bei-n...