![]() Someone else suggested printing a frame and just covering with paper which is another interesting option - although certainly much more time consuming. Another nice thing is the estimates the slicing software provides for grams of filament used (helps me estimate weight of resulting print and could keep me from needing to prototype so much). Thanks very much for the 10:1 volume ratio estimate - I setup PLA as a material type in Open Rocket and the calculations of weight are not too far off for solid objects - printed 4-layer-wide fines - although depends on size of part and infill. I need to do some tests to see how minimalistic I can keep a fin to get good quality, durability, and minimize weight. 15mm layers in this print to get slightly better quality. I usually do not get great top layer quality without a few layers at least of thickness. I was thinking of something similar to what you describe - design a frame and thin surface, print in 2 mirrored halves, and glue together. I have access to SLA printers at school but only have an FDM one at home. Here are some good resources to get you started. In addition to the advice here, you should be learning on your own. The fluid dynamics and performance of lattice fin-equipped bombs, rockets.
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