Any3Dway Models 3D printed ballasting machine for TT120 scale. Simply fill the machine and push along fixed track to create ballast effect which needs to be glued in place. Watered down PVA, Ballast Gkue or Scenic Cement from Woodland Scenics are recommended. The ballasting machine is great for straight and curved track, but not advised to be used on pointwork as the tracks on a point will foul the machine.