You printed a bracket. Corners lifted. You bump infill from 20% to 40% and print it again. Same warp.

Infill is not the problem.

The bed was 70°C. The room is 22°C. When that part leaves the plate, the bottom shrinks slower than the top. PETG and ABS do this every time if the chamber is open.

What actually works:

• Keep the bed hot until the part is done cooling. Don't yank it at 40°C.

• Brim, not raft. Raft hides a bad first layer.

• Enclosure — or a cardboard box around the printer. Drafts kill dimensional parts.

• Dry filament. Wet PETG warps and strings and you will blame the STL.

If you want the files already oriented and split for this, that's the STL pack. If the printer itself is the problem — clogged nozzle, offset Z, heat creep — that's a separate 1-hour remote session. Different product. Don't mix them.

Print the next jig once. Not four times.