Inverted/Reversed + Centered Z axis Tevo Tarantula

thingiverse

Why this change? Lowering the motor from the z-axis eliminates unbalance in height, thereby reducing vibration throughout the printer. Furthermore, the plastic support of this axis was not very rigid, thus reducing precision. To avoid applying a moment to the rising profiles and achieve a balanced structure, the Z axis must coincide with the center of gravity of the part supported by this axis. By applying the equation to find the center of gravity for a system of solids (http://hyperphysics.phy-astr.gsu.edu/hbase/cm.html), I found that it was 295mm from the left of the X-profile (see picture). Although reaching this value is not easily possible, we can at least approach it. In fact, I reached 340mm, which is contrary to the standard Z axis at 380mm. By reducing the dimension of the bed levelling knobs, you can best approach the desired value. What do I need? Two versions of the top holder are available. One part requires a Z809 bearing (8-22mm inner-outer diameter), while the other needs nothing. I have not tried the second version, so please provide feedback if it needs to be improved.