Download all the STL files from below. All the files are already oriented so you don't have to rotate any of them. Just import one by one into Repetier and slice them for 3D print.
I've used 2 perimeters, 5% infill, no supports, PLA material, 0.2mm layer height and a 0.4mm nozzle.
I've used Creality CR10 for most of the prints. You could also download all the G.codes from below, already created. But, I recommend you to use your own Slicer settings and create your own G.codes for your printer and avoid errors.