Inverted/Reversed + Centered Z axis Tevo Tarantula

cults3d

Why this change? Lowering the motor from the Z axis eliminates unbalance in height and thus reduces vibration throughout the printer. In addition, the plastic support of this axis was not very rigid and thus reduced precision. In order to avoid applying a moment to the rising profiles and thus have a balanced structure, the Z axis must coincide with the centre of gravity of the part supported by this axis. By applying the equation to find the centre of gravity for a system of solids (http://hyperphysics.phy-astr.gsu.edu/hbase/cm.html) I could find that it was 295mm from the left of the X-profile (see picture). It is not easily possible to reach this value but we can at least approach it (reached 340mm contrary to the standard Z axis at 380mm). By reducing the dimension of the bed levelling knobs, you can best approach the value what I will do in a next future. What do I need? 2 Versions of the top holder is available. One part needs a Z809 bearing (8-22mm inner-outer diameter) and the other needs nothing. I have not tried the second version so give me feedback if it need to be improved.