On the V-Minion web page it has 3d picture showing the orientation of all the parts. The orientation for the tension_slider_6mm_belt_M3s.stl part appears to be incorrect and differs from the orientation on the EVA site.
https://v-minion.ratrig.com/printed_parts/#printed-parts-orientation:


EVA image came from a screenshot on discord. Not sure where that information is actually posted.