No doubt I have left out many interesting OEMs, but now and today, am I convinced these are the top three, taking into account just its versatility when manufacturing end-use parts for UAVs.
1: Stratasys
2: 3D Systems
3: EOS
Their three shared main advantages are their efficiency, their reliability, and their range of materials. Again: I have left out many interesting OEMs, but the market is moving on, and I think we will see interesting developments in a mid term future.