Hyperinflation was another massive threat as they printed so much unnecessary money just to pay reparations which lead to the price of the money rapidly dropping. This affected the Weimar Republic because the less value the money is the bigger quantity you need to pay, this also affected the economics of the Weimar Republic and also social affects for the people living in Germany during this period therefore make it a big threat.
The Munich (beer hall) Putsch was the final major catastrophe that affects the Weimar Republic dramatically as it was when Hitler tried to take over power from the Republic to Nationalist/Nazis, which affected the Weimar Republic on all aspects but without it we wouldn’t have the life we have now, however the Weimar Republic didn’t seem to mind that much as if they did they would of acted faster and more efficiently than they did therefore makes it a huge threat.
In conclusion I think that the Ruhr Crisis was the greatest threat on the Weimar Republic however the other two catastrophes were a colossal threat as well although without the Ruhr Crisis none of the other events would have been such a great threat.