The main defendant was sentenced to three and a half years in prison in the Tübingen trial for setting up an arms store.
The court saw it as proven that the 37-year-old possessed several weapons of war, fully automatic machine guns as well as various ammunition and firing devices.
The native of Thuringia even stored a sharp weapon in his few-month-old daughter's changing room, said the presiding judge on Tuesday.
At the beginning of the trial in July, the defendant admitted to having built up the weapons depot.
"I started doing it in 2015 because of the refugee crisis and felt threatened because of the unrest," he said.
He rejected the prosecution's allegation that he had also manufactured explosives.
However, it was clear to the court that he had chemicals for the construction of smaller explosives.
The defendant's three accomplices were sentenced to suspended sentences and community hours.
According to the court, they removed part of the arsenal to protect the main defendant.
His 24-year-old partner was sentenced to ten months probation, two men - 48 and 43 years old - one year and three months and eight months, respectively.