This is a larger version of Lofts1 with some important changes: the piece starts with a larger base, is taller, and the top edges align with the bottom edges. Overall I think this one has much better proportions. I posted a short video of the piece here: https://youtu.be/mxexKl3r3tA. Check out the Lofts1 page for info about how I designed this piece.

Lofts3 printed in 19 1/2 hours using a layer height of 0.200 mm and a print speed of 80 mm/sec. Because of the complex internal geometry of the part there is a fair amount of internal infill. To save filament and printing time I'd suggest using an infill value of 10%. My print used my default of 20% which is much more than is needed.