In the FILES section there are tree *.stl files.
SUPP_NUT.stl , it's the support for the nuts of the lead screw. You need print 3 of this.
SUP_LINEAR.stl, it's a suplement for each linear bearing. This piece it's neccesary for the table can move over the stepper motor. You need print 12 of this.
SUPP_LEAD.stl, it's de suplement for each bearing support of the lead screw, and it's neccesary to put a the same level the lead screw and the motor shaft. Yo need print 6 of this.
Sorry for my english.