A Kossel doesn't need to have the expensive linear slides. I believed they moved to them with the Kossel pro. Many have used delrin wheels with bearings, with various extrusions. Some just have plastic carriage which fits 6 or so bearings and they slide on aluminum or steel tubing. Lots of options. Be sure to check out the magnetic joint variation as well as the cerberus and the cerberus pup. I just saw one the other day with rods and extrusion.
In short, the borders are quite loose. Also, Ibought a few things which were out-tech'd before I could install them on my machine.
But to answer your question specifically, it seems some complain about the linear bearings being noisy on the rods (rostock), especially after some use.
EDIT: also when you go to purchase you'll discover shipping and buying one of each piece is the major cause of higher prices. Besides the electronics and motors, it might very cheap to build a second or third if costs permit.
In short, the borders are quite loose. Also, Ibought a few things which were out-tech'd before I could install them on my machine.
But to answer your question specifically, it seems some complain about the linear bearings being noisy on the rods (rostock), especially after some use.
EDIT: also when you go to purchase you'll discover shipping and buying one of each piece is the major cause of higher prices. Besides the electronics and motors, it might very cheap to build a second or third if costs permit.
