New Maslow Rhino drawings on MAC

Hi, I recieved my maslow last week and I am preparing some projects now.

I started drawing in sketchup years ago but since a circle isn’t a circle in sketchup I decided to use Rhino.

I had a look at easel to generate the g-code. For text carving it seems to do it fine (rhino export .DXF and easel .DXF import) but I cannot create for example dog bones to create a clean tongue and groove joint as I get open path errors.

Is there a Mac and Rhino user who could point me in the right direction?