35 Spacer Sets

Spacer Sets is a drawing file for laser cutting 35 sets of marble track Spacer, which inventor Rich Maxwell developed with elementary students in KC area schools. The genius of the ideas is students can construct a marble run as long and as complicated as their imagination will allow, using hardware store supplies: 16 gauge wire inside 1/4 in. tubing, mounted on 3/8-inch dowel rods anchored in 5/8-inch compressed wood bases. www.marblekeeper.com