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Help on CoreXY build (1 reply)

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Hi everyone,

After building a crane style bot (with V-slot), now building a Core-XY with linear rods. Build size 100*100*100mm.

I am facing some issues when homing and while printing.

In the image 'Corexy.jpg[attachment 85207 Corexy.jpg]', the left side motor is connected to X motor connection in RAMPS, right side motor is connected to Y motor in RAMPS, left side endstop in X-carriage is connected to X-min endstop in RAMPS, backside endstop is connected to Y-min endstop in RAMPS.

When the X-carriage is at the front side (away from the motors), the X homing is done properly. The hot end moves to the left side and hits the endstop smoothly. (Refer '[attachment 85208 HomeXatback.3gp]')

Also Y homing is also done properly with the same condition (X-carriage is at the front side, away from the motors). X-carriage moves to the back side and hits the back endstop smoothly.

Now the problem arises when the X-carriage is at the back side (near by the XY motors). When I click 'X home', it is moving towards the X endstop, but not triggering it, stoping before the endstop.

And the same, when the X-carriage is at the back side, and when I click 'Y home, the hot end is moving strangely and not at all homing Y. (Refer [attachment 85209 Xhomingnotdoneproperly.3gp]', [attachment 85211 Yhomeactingstrange.3gp]').

I tried with motor wires swapping, X Y motors swapping, endstop swapping and tried with true and false values in Marlin also. ([attachment 85214 Configuration.h] file attached.)

Also, after homing, if I move, Y axis by 90mm, X carriage is also moving along with Y. (Refer '[attachment 85212 Xmoving90mm.3gp]', '[attachment 85213 Ymoving90mm1.3gp]')

Same, when I move X axis by some value, Y is also moving with X carriage. Is it the normal property of Core-XY.

I am using Arduino+RAMPS with Marlin RC7. Using original E3d Lite6, MK8 extruder. I have attached the images, videos and config file also.

Also, I just printed a 20mm cube without filament. Instead of square movements, the printer is moving in parallelogram motion. (Looking like 15 degree inclined).

And how to get perfect tension with CoreXY. When I tighten the belt in the hot end mount, the mount gets inclined (X-carriage not perpendicular to Y-axis). But when I did the normal tight, X and Y are perpendicular.

Help me to proceed further.

Thanks & Regards
Selva

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