I recently got this K8200 for my upcomming birthday in april. (Lol, my wife was thinking I would need weeks and weeks to build it, because the complete building PDF is about 760 pages)
So, I was a bit frustrated after my first print.
I printed a test-cube of 25 x 25 x 25 mm.
X and Y where off by a 10th of a millimeter. (so far, so good),
but the height of the cube, was only about 21 millimeters, instead of 25 millimeters !
I didn’t make any modifications to the machine (yet), only standard assembly like described in the building manual.
I did put the voltage of the Z-axis stepper upto 0.55V, but this does not help.
However, when I try to run the motor up and down for 10 mm, I perfectly get 8 exact rotations …
One thing I noticed, is when I use the “park” feature within Repetier, the X- and Y-axis can’t be moved by hand, but the Z-axis screw can be turned by hand !
Also, when printing, just before the Z-axis goes up, I notice a “click” in the motor.
It seems like the motor does not get any power to hold its torque, but only gets power when it needs to move …
When “switching” 2 motors, the problems stays with the Z-axis connection, not with the motor.
May I assume that my Z-axis driver on the controllerboard is DOA ?
Should I contact Velleman to replace my Z-axis driver ?
I can count myself as “somewhat” experienced, so “more complex” tests, to solve my problem, are welcome.
Also posting pictures or movies, to “make some things clear” is no problem
(I already have an Elektor Colinbus Profiler CNC, a 50W CO2 laser CNC, and an HBM BF-25 milling machine, that I converted myself to CNC, however this K8200 is my first 3D printer)