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Reminiscent of the renowned pastry from Bordeaux (France) le Canelé Bordelais, the main design element of this lamp is known to french mechanics engineers as cannelure.
I designed this lamp with the goal to utilize the spiral-vase 3D printing mode to create a beautiful object, with a minimalist, retro, industrial style.
Yes, 3mf files have all the tweaks ready, but it's always a good idea to double check. Let me know on printables if you have any issues.
90% infill would be a lot of plastic. Much more expensive than the plaster, but you do you. For info, the finished base with the plaster weights something like 350g and it's a similar weight to the shade. PrusaSlicer give an estimate of the material use after slicing. I would recommend to do it only if the base would be at least 300g otherwise the lamp might not be very stable. Maybe you can optimize things by having 100% infill for a portion at the bottom (top of the model) and a 5% infill for the rest, to make the center of mass as low as possible.
Another alternative could be epoxying some beefy metal nuts around the inner perimeter, mostly towards the bottom.