I believe that you lack the necessary foundation of basic economics which was taught in high-school since printing money will cause inflationary effects in a country, which may eventually proceed to hyperinflation. Although inflation may be shown in a negative aspect, printing money is also a method of the central bank to control inflation. If there is a high supply of products in the market, prices would go down in order for the demand to increase. Central banks may utilize this method in order to increase money supply but this must also be accompanied by increase level of production in order to cope with the unemployment rate during recession.
If banks print more money without any accompaniment or whatsoever, this will devalue the currency of a country resulting to hyperinflation- which in the case of Zimbabwe, the denomination of their currency is absurdly and abnormally high.
The amount that your country will depend on the amount of gold that your country stores. So if you print more money than the amount of gold that the country stores, your currency will fall in price than the money of another country. This will make your country's economy difficult. This is called inflation.
This is actually true. The value of each currency depends on the number of gold reserve the country has. If you print more money that is over the value of the number of gold reserves, then this would eventually lead to the currency being devalued- which again causes hyperinflation.
... 
