Contraptor
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How it works
If you have built things out of Erector or Meccano, then you already know how to build structures with Contraptor.
The following video examples show how to build the basic linear motion assemblies of the set - belt drive and leadscrew drive.
 Right angles and parallels |  Sliding element on a rail |  Belt clamp on sliding element |
 Belt, pulleys and shaft mounts |  Mounting the motor |  Limit switch |
 Belt drive |  Lead nut in sliding element |  Leadscrew on shaft mounts |
 Leadscrew drive |