Not to derail this thread...but... the current plan is to have a platform for each shoulder that you just stake into the ground. (You can have strings that you stretch tight to get the optimal placement.) At this point you go through a calibration routine over the area that you want to print on. (I am thinking it will be a sheet of MDF laying in the grass.)
If you want to discuss a jumbo Simpson project, let's start another thread. I have definitely been spending some cycles on this. I have some hot ends being made that accept 5mm and output 1.75mm. We have also found a source for 5mm filament in any color for around $10/pound. I think the xDrive is the front runner for the drive mechanism. However, just extending the forearm past the joint to get the right leverage might also be good enough.
If you want to discuss a jumbo Simpson project, let's start another thread. I have definitely been spending some cycles on this. I have some hot ends being made that accept 5mm and output 1.75mm. We have also found a source for 5mm filament in any color for around $10/pound. I think the xDrive is the front runner for the drive mechanism. However, just extending the forearm past the joint to get the right leverage might also be good enough.