I've googled around to try and find a solution but I couldn't quite find one. I'm making a design to be laser cut and to do that I had to export to a dsf, but when that happens, the file turns up with too many lines and very messy as seen below. Is there anything I'm doing wrong or something I can do to fix this? 

Presuming you are trying to export a dxf (not dsf), what are the steps you are taking?

I typically use: Save a Copy, as dfx r14.