This same rule applies between MASTER plastic rattan molding

As easy as MASTER plastic rattan molding is to make holes in molded parts it does not come without some concerns for the strength of the part. For every cored or molded hole there will be a weld line. The weld lines are caused by the flow of the melted plastic around the core pins. These weld lines are not as strong as the surrounding plastic material, and also may detract from the overall appearance of the MASTER injection mould part. The part designer should consider these points when designing holes in a molded part.