I was able to open the file OK in BenCutLaser but saw some things I want to ask you about.
1. The Lines are ***extremely*** small. The horizontal lines are only 0.45 mm long. The top vertical lines are about 0.25 mm high. Is this a mistake or by design?
2. There are several places in the drawing where there are many over lapping lines...see attachment. You need to remove these double and triple lines. There are about 330 Line objects in total in this drawing at the moment.
What percentage of the whole drawing would you say this file, in its current state, represents? 10%, 20%, 50% of the final file?
Once I see your answers to these questions I'll have more comments to make.
Thanks for letting me have a look at it.
It opened fine in LibreCAD which is a free 2D CAD program.
It also opened up fine in QCAD which is also a free 2D CAD program.