ROBO3D z Lock for transport

I was printing this kit http://www.thingiverse.com/thing:234939 but when I test the z- axes it doesn't Lock very well, so I made the simple way to Lock the z axes and it is faster to print and worked at the first time. I don't like the y-axes on the link ether, the bed stop you can take some rubber band to lock it to the x-axes and the printed part on the bed