Originally downloaded from Thingiverse and also available as an Instructable. Created by M Raynsford and sold on his web site. He has given us permission to reproduce the work (with his branding) for our own promotions.
I have created and tested multiple DXF versions with the aim of minimising the cost per item. Each plan fits on approximately 300x250x3mm MDF and uses 10mm spheres. I didn't want to scale up to standard 16mm marbles as the wood and cutting cost scale too.
Currently each unit is approximately:
Moving the job to the large laser cutter will reduce the wood wastage (and drop material cost) and take less time (and drop the cutting cost) but I doubt the branding can be etched on that machine. My aim is to get to under $1 production cost then sell for $2 and give them away too.