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Sounds terrible. But I encourage you to try it, it is a good exercise in understanding the material better. Maybe try a smaller scale first
I don’t know what PLA cost but this is $25 and will actually do the job.
No. Go buy a shovel, it will probably be cheaper than the filament anyway and actually be able to do what you want.
No
How big is the printer? This sounds like a very expensive, bad idea.
I was thinking something like a chisel, but yeah, these comments suggest even that would break before the ice.
Try salt?