As part of a diploma thesis, researchers from the Polytechnic University of Milan (Politecnico di Milano) have developed a new selective laser melting system (SLM) with the ability to correct defective layers during the printing process.
An infrared video system monitors the process with a resolution of 20 μm / pixel and detects errors, which are then corrected through a grinding wheel attached to the y-axis. The current prototype named
PENELOPE has a grinding system with a grain size of 120 μm, a speed of up to 4,000 rpm, a feed rate of 30 mm / s and a cutting depth of 10-20 μm.
The process is patent pending.