Used this customiser for a locking mechanism. Im very happy with the results! The springback is minimal, even though I didnt let it cure in hot water that long. Also surprised by the stiffness of the spring. Its actually usable :D I did set the filament diameter to 2.2mm, even though Im using 1.75mm filament.

Tip when printing in PLA: use quite some perimeters (5 or more) and about 15% infill, so the mold doesnt deform when putting it in hot warm