I imagine crashing the nozzle into your build surface could cause quite a bit of damage!
And you'd be right!
However, the magnetic ball joints let go before it does any damage.
The torque multiplication was part of what I wanted. Fast printing needs high acceleration which requires torque.
On a different (commercial) project I found the stretch in timing belts to be an issue moving the end effector fast - it needed high precision and the elasticity in the belt caused judder in the position. That was solved using lead screws - and hopefully they will benefit this for the same reason.
Si