Oof. This was a hassle and a half to get right. Learned a good bit tho. The trick was to lower the part by 1mm to get more surface area on the bed.
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You could have made your life easier also by using a brim. You'd probably have to do some trimming afterwards, though.
The author could have made everyone's life easier by making the bottom of the model flat, or making it square in cross section.
I did try a brim. It was a huge hassle to remove. I don't mind brims on larger, simple parts, but on these smaller, intricate ones, it sucks.