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From RepRapWiki See RepStrap . A repstrap is a 3D printer cobbled together from whatever parts you can find, which will eventually allow you to print the parts for a reprap machine , or to simply use as a stand alone machine. Derived from the term bootstrap , as in "to pull yourself up by your bootstraps" A RepStrap is a open-hardware rapid prototyping machine which is made by fabrication processes which aren't under the RepRap umbrella yet.