Sorry but we do not have a cutting service for these. We nearest we stock is 40 and 60mm. MakerBeam products are cut in the factory before being shipped to Europe.
The few times we have cut down MakerBeam or OpenBeam with a hacksaw, we have then turned them in the lathe to ensure a clean and accurate end but this is time consuming and not economical for us to do for customers. They really should be cut to length using a CNC saw, might be worth checking your local machining shops to see if they can help. There will still be waste though from the cut but at least the ends will be clean and square.