1. The pressure between the two axises can not be too tight, or it will damage the knife.
2. Please check whether there is the ground line for your power supply.
3. Please be concentrate you mind when you make puzzle, don't put your hand in the middle of the mould while processing, for it may take your hand in.
4. Do not put the machine into too wet environment, keep it away from water and erosive liquid.
5. Put the power off when the machine is left free.