prusa i3 first print problems

hi there, i have just finished building my first ever 3d printer, it's a prusa i3 acrylic. the problem is when i try to print the 20mm cube to calibrate the printer repetier-host just sends the extruder to the right rear corner of the bed (this is the home position) and doesn't move the x or y axis from there, though the extruder does extrude filament and the z axis does keep lifting as if it is printing the layers.

i have mechanical end stops and they are set like so, the Y end stop is at the front of the y frame, the X end stop is at the right side of the X frame, and the Z end stop is at the bottom. i have attached my config file to see if anyone can see what's wrong but i have set my end stops like this

#define X_HOME_DIR 1
#define Y_HOME_DIR 1
#define Z_HOME_DIR -1

which i think is right? but maybe i'm wrong

thanks in advance for any help on this

phil

Home all axes then run M114. (It should return X=0, Y=0, Z=0)

Then enter G1 X100 Y100 and see if the nozzle moves to the center of the bed.

Run M114 again and see if the printer knows where the nozzle is located... my guess is that it doesn't, and is trying to print off the boundary of the bed.

Edited 1 time(s). Last edit at 02/16/2015 01:52PM by MindRealm.

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-David

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Check out my FolgerTech Prusa i3 (plexi) at MindRealm.net

thanks for taking the time to help me david, it's much appreciated. once all axes were homed M114 output

19:17:16.237 : X:200.00 Y:200.00 Z:0.00 E:0.00 Count X: 200.00 Y:200.00 Z:0.00

and after G1 X100 Y100 was entered and the print head moved M114 output

19:17:32.299 : X:100.00 Y:100.00 Z:0.00 E:0.00 Count X: 100.00 Y:100.00 Z:0.00

for more information i have a ramps 1.4 and the X and Y end stops are connected to the max pins and the Z end stop is connected to the min pins, so with the USB plug at the bottom the end stop pins are filled like so

empty
Z
Y
empty
X
empty

does this help any in working out the issue?

thanks
phil

Edited 1 time(s). Last edit at 02/16/2015 02:52PM by happyharrysco1.

OK, so the result

19:17:16.237 : X:200.00 Y:200.00 Z:0.00 E:0.00 Count X: 200.00 Y:200.00 Z:0.00 

means that the printer is not at 0,0,0, where the slicing software begins. Try running G1 X0 Y0 Z0 before starting your print. (don't home the axes again, just run the command...)



Edited 1 time(s). Last edit at 02/16/2015 03:22PM by MindRealm.

---

-David

Find me online at:
Thingiverse
Instructables.com
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Facebook

Check out my FolgerTech Prusa i3 (plexi) at MindRealm.net

thanks again for the help, after running the command the bed does go to that point, but as soon as i press print it automatically goes to the home positions to heat the bed and extruder. but with your info about where the slicers starts i have found the problem, turns out that in repetier you have to tell it where the end stops are i relation to the bed (i would have thought the firmware would have been enough) in the 'printer settings'/'printer shape' tab. so this has the printer at least moving in the correct directions, now i need to work out what's up with the extruder :/