Repetier Host print preview not in sync

[Linnearuk]

Hi

I've just built a i3 Pro B and everything seems operational

All motors move in correct directions
All endstops work
Homing all axes sends them home

BUT

When I load a project into Repetier despite centring it using the centre button and it appearing to be in the centre of the field it starts printing at Y = 0 and it appears to be trying to print correctly but I lose half the print because the endstop stops it moving further back (as it should)

Any ideas how I fix this lack of synchronisation between the print preview and the printer?

(The X and Z axis appear to be perfectly fine)

[Gingko]

Have you checked the voltage of A4988 of Y axis? Maybe it's a little low, up to 1.0V to have a try.
if no help, swap the A4988 and reburn the firmware.
and you can test the .gco file from attachment.

[Linnearuk]

Tried playing with bed front and setting endstop to Y max last night but to no avail so I'll try this.

Many thanks

[Linnearuk]

The prob test print almost worked but as the y axis tries to live back toward the origin it "judders"

(no issues forward)

Complete novice here but could it be a belt tension issue?

(I don't have a meter to test amps, volts etc., sorry)

[Gingko]

Yes, you can check the tightness of Y-axis, loosen it a little to have a try
or swap the driver(A4988) and see if the Y-axis can move normally or not.

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