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Development plan
1. Armstrong parallel SCARA printer model B
* Redesign to solve imprecise motion in the original A1 design
1.1 New generation harmonic drives about done
* Large diameter bearings to better constrain the motion
* Drives stackable on a single axis, eliminating axis offset problems
1.2 Rigid chain actuator to move the assembly or the print surface
* Done
1.3 Constraining the motion of the rigid chain actuator
* Sarrus linkage, WIP