Quote from mikej on January 16, 2014, 23:02
Both of those are normal length (not double long) so you'd need 2 per side (4 total) vs the others.
Then you might get into the same problem that was fixed with a single sleeve on each side, if you use 2 on each side.
I have been using the double long bearings for several months now and through the Christmas rush. They preformed great! I haven't had to adjust the tightness of the Z axis assembly since installing them. I just clean the lead screw and guide rods every so often (dust and what not) apply a little new oil and lubricant and keep on printing.