Had to have a go at this. I printed the model completely hollow using Hobbyking Transparent PLA. Ended up just a couple of mins under 8 hours, the longest print so far since I switched to the Duet. So in the morning, this was the result. Those of you with the PEI bed know that this lifted cleanly away. After a little work with a hobby knife: Next job was to ask my wife where the hairdryer was and after some effort: I could have probably had a more transparent feel, but I left the blower on 100% from layer 2 as I thought the bridging would probably need it, so better to have a consistent feel to the whole item. Finally, popped him on the scales: Interestingly, S3D suggested 5 hours 48, actual was 7 hours 57. S3D also suggested 65.9g where actual was 34g. Either the filament density I have set up (1.25 grams/cm3) is wrong, or S3D is also wildly out on this calculation along with the timing.