Sliding Vice

Whilst using some of the earlier vices I have designed and 3D Printed I noticed that there was a design flaw, when applying pressure the jaw attached to the screw can jump up, I was trying to push 2 components together at the time and probably applying too much force, these vices are 3D printed in PLA so I was probably expecting too much.Anyways I thought I would have a go at designing and printing a rail type vice, where the jaw attached to the screw drive slides on rails, this would eliminate