There's a lot of pressure in those dies, caused by moving lead. I would check the tensile strength of the lead material, then compare that to the tensile strength of the 3-D printed material

I tried it as failed with PETG,ABS, ASA, PLA+ on my Ender5 and quiet. Swaging produces too much force for the prints, either the lead sticks or blows the layer apart. This is a job for a lathe and not a FDM 3D printer - but it is manageable on home lathe.

I have another couple of videos on here that shows a casting setup that I used to to make the cores from pure lead, and one that shows me swaging the overweight cores down to finished and proper weight.

I meant the tooling you are using.

Ah, my mistake. This is an old Corbin www.corbins (remove this and all spaces) .com Mitey Mite press, cast in bronze. The dies are built to match the press. I do believe they're 5/8x24 dies. I have two sets of dies, one in .224 diameter for rifle bullets, and the others are for making .357 diameter handgun bullets.

KZfaq took that video down, but the answer is that I make them myself with a 5 or 6 cylinder mould that I made. It's a LOT like an inline 6 cylinder engine, except that the pistons all come to top dead center at the same time, for ejection purposes...