Solve the equation: $$ \frac{xy}{z}+\frac{yz}{x}+\frac{zx}{y}=3$$ where $x$, $y$ and $z$ are integers
1. **Analyze the equation:**
   \[
   \frac{xy}{z} + \frac{yz}{x} + \frac{zx}{y} = 3
   \]
   We need to find integer solutions for \(x\), \(y\), and \(z\).

2. **Consider the signs of \(x\), \(y\), and \(z\):**
   Since all terms \(\frac{xy}{z}\), \(\frac{yz}{x}\), and \(\frac{zx}{y}\) must have the same sign, they must all be positive or all negative. This implies either all of \(x, y, z\) are positive, or exactly two of them are negative.

3. **Simplify the problem by considering positive integers:**
   Without loss of generality, assume \(x, y, z > 0\). We can later generalize the solution to include negative values.

4. **Order the variables:**
   Assume \(x \geq y \geq z > 0\). This helps in reducing the number of cases to consider.

5. **Bound the values of \(x\):**
   Since \(\frac{xy}{z} < 3\), we have:
   \[
   xy < 3z \implies x < 3 \quad \text{(since \(y \geq z\))}
   \]
   Therefore, \(x\) can only be 1 or 2.

6. **Case \(x = 1\):**
   \[
   \frac{1 \cdot y}{z} + \frac{y \cdot z}{1} + \frac{z \cdot 1}{y} = 3
   \]
   Simplifying, we get:
   \[
   \frac{y}{z} + yz + \frac{z}{y} = 3
   \]
   For \(y = 1\) and \(z = 1\):
   \[
   \frac{1}{1} + 1 \cdot 1 + \frac{1}{1} = 1 + 1 + 1 = 3
   \]
   This is a solution. Therefore, \((x, y, z) = (1, 1, 1)\).

7. **Case \(x = 2\):**
   \[
   \frac{2 \cdot y}{z} + \frac{y \cdot z}{2} + \frac{z \cdot 2}{y} = 3
   \]
   Simplifying, we get:
   \[
   \frac{2y}{z} + \frac{yz}{2} + \frac{2z}{y} = 3
   \]
   We need to check possible values for \(y\) and \(z\):
   - If \(y = 2\) and \(z = 2\):
     \[
     \frac{2 \cdot 2}{2} + \frac{2 \cdot 2}{2} + \frac{2 \cdot 2}{2} = 2 + 2 + 2 = 6 \quad (\text{not a solution})
     \]
   - If \(y = 2\) and \(z = 1\):
     \[
     \frac{2 \cdot 2}{1} + \frac{2 \cdot 1}{2} + \frac{1 \cdot 2}{2} = 4 + 1 + 1 = 6 \quad (\text{not a solution})
     \]
   - If \(y = 1\) and \(z = 1\):
     \[
     \frac{2 \cdot 1}{1} + \frac{1 \cdot 1}{2} + \frac{1 \cdot 2}{1} = 2 + \frac{1}{2} + 2 = 4.5 \quad (\text{not a solution})
     \]

8. **Generalize to include negative values:**
   Since the equation is symmetric in \(x, y, z\), the solutions with negative values can be derived by changing the signs of the positive solution \((1, 1, 1)\):
   - \((1, 1, 1)\)
   - \((1, -1, -1)\)
   - \((-1, 1, -1)\)
   - \((-1, -1, 1)\)

The final answer is \( \boxed{ (1, 1, 1) } \), \((1, -1, -1)\), \((-1, 1, -1)\), and \((-1, -1, 1)\).