Y Axis - Not homing / moving correctly (Wanhao i3 Plus / Balco Touch)

[Martin_au]

I see the problem. I'm pretty sure your belt is reversed. The carriage attachments should be below the free belt.

Check out this thing. It shows the correct belt configuration.https://www.thingiverse.com/thing:3676895

Other things to watch for on the i3 Plus:
Y-axis idler twisting - Lots of easy mods to brace it.
X-axis coming loose - I've got a nice X-Z axis rebuild that makes maintenance a lot easier and the printer much more robust - https://www.thingiverse.com/martin_au/designs
Extruder lever wearing out - 3D printed replacement is available in my collection, or you can grab a metal one.
Bed wires wearing where they go through the 20x20mm hole in the Y-carriage. Wrap with some tape, or if possible get a replalcement aluminium carriage.

[TenbagUK]

I see the problem. I'm pretty sure your belt is reversed. The carriage attachments should be below the free belt.

Check out this thing. It shows the correct belt configuration.https://www.thingiverse.com/thing:3676895

Other things to watch for on the i3 Plus:
Y-axis idler twisting - Lots of easy mods to brace it.
X-axis coming loose - I've got a nice X-Z axis rebuild that makes maintenance a lot easier and the printer much more robust - https://www.thingiverse.com/martin_au/designs
Extruder lever wearing out - 3D printed replacement is available in my collection, or you can grab a metal one.
Bed wires wearing where they go through the 20x20mm hole in the Y-carriage. Wrap with some tape, or if possible get a replalcement aluminium carriage.

Thanks for those suggestions, and thanks for all the help. This is where my difficulty with mechanics (and / or observation!) comes into play. I can't quite see what I need to do to my belt to make it match the picture you show (in terms of its orientation, not the extra 3d printed parts). How would I go about getting my carriage attachments under the belt? I feel a little dense but I often do with these things! I have ironically always really struggled with symmetry and orientation of mechanical / physical things - yet love to do hard surface 3d modeling of mechanical things.