Design Choices

Extensibility

• Unused pogo pins to enable future add-ons
• Stackable magnets to increase or decrease the coupling force

Reliability

• Bearings at key pivot points
• Metal contact surfaces
• Hard stops to protect limit switches

Toggle Actuation Mechanism:

...write more here... On the topic of servos vs stepper motors, E3D says that their "old Servo was struggling to exceed 60,000 tool changes whereas the new beastly Stepper Motor can easily surpass 400,000 cycles." Source

Serviceability

• No plastic threading screws
• Through-holes to support the removal of the toggle switches

Inserts

All key structural fasteners have heat staked inserts which are inserted from the opposite side to significantly reduce the likelihood of insert pullout