I just finished the assembly of the velleman k8400.
The instruction were very good I can say.
I am having some problems with the z axis calibration. And the instructions I am following are here: manuals.velleman.eu/article.php?id=22
Now when I do a Auto Home command I have some things going wrong. The head parks on the rear right, however I believe the end points are not correct. After it reaches the end point the motors continue spinning. As if the endpoint were not reached.
The second problem is that the Z axis doesn’t move at all. It doesn’t go up or down when I do an Auto Home command and neither when I do it manually via the Moves Axis commands(Move Z axis).
The Motor doesn’t seem to have any problems. I plugged it in the X axis for test and the motor is working well. However none of the motors will work when I plug them in the Z axis.
The LED where we plug the end points(X,Y,Z cables) are all the same so I couldn’t have plugged them in different order them.
Can anyone explain me what am I doing wrong, if I am.
If the X and Y end stops are not working check if you didn’t swap the cables to the end-stops (they’re at the same place so it’s very easy to plug them in the wrong end-stop : Y end-stop is on the right panel and the X on the back panel).
If it’s OK then check if the pulleys aren’t in the way blocking the movement before the head can reach the end-stops.
Ok, that problem was solved but I got a new one here.
The extruder doesn’t seem to work. I moved to the next step of the instruction where I can load the filament.
When I do a load filament, the head moves in the middle and the z axis goes down a bit.
The head tries to heat but it never reaches 210(that is the nozzle temperature as well the minimum temperature by default). It get stack at 175 degrees.
So I lowered the nozzle temperature manually to 160 and tried again. As soon as it gets to 160, the LED on the head starts flashing and the Loading filament process ends there without the nozzle purging any material. The extruder isn’t advancing the filament at all.
When I try moving the extruder axis manually(via the Move Axis menu) it doesn’t move.
I checked all the cables and they all seem to be in place correctly. The motor(extruder) doesn’t seem to have any problem because I plugged it in another axis and it was working like a charm.
160° is too low. The PLA will never melt enough. On the other hand under 170° there’s a safety preventing ‘cold extrusion’ and stopping the extruder.
[quote=“Leorenc”]When I try moving the extruder axis manually(via the Move Axis menu) it doesn’t move.[/quote]Same reason. If the heater is no hot the extruder won’t move.
Move the small fan a bit upward to prevent it blowing too much on the heater.
[quote=“raby”]160° is too low. The PLA will never melt enough. On the other hand under 170° there’s a safety preventing ‘cold extrusion’ and stopping the extruder.
[quote=“Leorenc”]When I try moving the extruder axis manually(via the Move Axis menu) it doesn’t move.[/quote]Same reason. If the heater is no hot the extruder won’t move.
Move the small fan a bit upward to prevent it blowing too much on the heater.[/quote]
I did what you suggested. Moving the small fan a bit prevented it from blowing too much the head so it could reach 210. However the results were not the best.
The beck from the head heated to 210 and the it melt the plastic holding it.
See pictures
[quote=“Leorenc”]it melt the plastic holding it.[/quote]This can’t happen at 210°. It means the temperature is way over 210° (and even 245°) and your NTC must not be seated correctly in its hole.
And what explains that the extruder never worked. Because even that it heated up to 210, the extruder still didn’t work.
And if this is more than 210 or 245 then the thermometer must have a problem.
