I expect that you have created the 2D drawing of the part in Spaceclaim, file new\drawing sheet.
Make sure that the scale is 1:1
Next, go to DISPLAY and make it HIDDEN line removed, it is under the Graphic tab/dropdown
There is NO export in SC, so save as DXF, making sure that the 1:1 scale is ticked and the DRAWING format option is UNTICKED.
Finally make sure you use ACAD12 as the output Verison type, the rest just go haywire
next in 2D import, make sure that the bits for inches is changed to metric (a 50mm box is very large at 50 inches), finally remove teh IMPORT as a group. then press OK
You should have the parts on the screen, you now need to remoe all the bits you don't want, including the SPACECLAIM water mark.
The water mrk is not a solid delete, but loads of small lines, becareful not to delete your drawing. SC exports a hole as 2 semi circles and corner rounds a 2 parts
Finally, finally set it up for your laser