Joint rigidity: Replace the thick plastic sheet with 1 thin metal + 1 plastic sheet.

[faerietree]

Currently such metal sheets are impossible to manufacture because the possibilities of worlddevelopment are limited (no press, no lathe, no mill, no sheet cutter).

Once the 5 axis manipulator is constructed, a mill immediately is within reach as all mill requirements but the trajectory support are easier to achieve than those of the fruit nut vegetable carer.