It is not an error, it is a feature ;-)
You probably have a brim or raft selected. This prints around the object, so if you would place the object at the edge of the buildplate, it would print the brim/raft partially outside the buildplate.
To get the fullest buildvolume, you need:
- adhesion type = brim
- brim line count = 0
- travel avoid distance = 0
- horizontal expansion = 0
- support horizontal expansion = 0 (if support is enabled)
- draft shield disabled
- ooze shield disabled
- infill wipe distance = 0
Note that in most cases brim with brim line count=0 will get you most of the way there
It's indeed an error in Cura 2.3
It's not only for custom printers, I tried the 2+ and the 3, you can also not use the full bed for these.
I reported the issue already (I'm in the "3" beta test group) so I'm pretty sure it's being addressed.
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