so guys, i just looked this topic:
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forums.reprap.org]
and then i think... if you take this rotary table for Y axis purpose,
and this parallel arm scara arms for X-Z axis
[
forums.reprap.org]
then we have fully printable 3d printer without any linear rail, just bearings. Only problem is to solve extruder angle to rotary table, because its not always 90 degree to board...
i don know if any mechanical solutions is possible....
what do you think?