Delta-Pi redesigned top clamp and idler assembly with tensioner

The Delta-Pi motor mounts allow the stepper's position to be adjusted vertically by a few mm, thereby adjusting the GT2 belt tension, however this is far from practical since the steppers are mounted under the base. Once the printer is assembled and running it is highly unlikely that it can be disassembled / decommissioned for such trivial maintenance as adding a little bit of tension to one of the GT2 belts.

I started thinking about this a couple of weeks ago and this week I began writing so