Print laying flat with supports touching buildplate only. After printing remove the small amount of support generated by your slicer and remove the built-in support parts from the jaw areas. The adjustment wheels should be able to rotate and the jaws move once the built-in supports are removed and discarded.
All of the objects are similar, with the main difference being the text on the ends. The objects in the photos are the "alt" and "sae" versions. They were printed at 0.15mm layer height.