1. X-Ray has very high initial costs. Not only the system itself, but also getting the system installed with all necessary protections against x-ray is costing lots of money. => Expensive
2. X-Ray is dangerous and the people must be protected from the beams. => Dangerous and expensive protection
3. X-ray requires specially trained people who know how to operate x-ray based units => Training costs for operators
4. X-Ray source is a wearing part. The x-ray source need to be replaced frequently => High maintenance costs
5. Measuring position ether a few meters away from the extruder or cold end. If on the cold end, then it can not be used to control the line. If some meters after the extruder, then no cold values for reporting. In combination with additional diameter heads the price is even bigger. => Expensive
6. The measuring rate is about 10 measurements per second with x-ray. UMAC is doing about 250-15’000 measurements. => slow measurement