This is a strong, lightweight and fast to print hinge that takes a long M3 nut and bolt.  I’ve integrated a hex hole for the hex nut that the bolt threads into. You can use ultimaker print-head long bolts if they are not in use. If you want the hinge stiffer with even less play, edit the design and reduce the hole diameter by 0.1mm.  See more things I'm involved in at https://www.facebook.com/tinlynxNotes:- print 0.1mm layers, 100% infill, 1mm walls.- no sanding of contact parts necessary.