1lb printable plates for fractional/micro loading an Olympic (2") bar.
The 3d rendering preview on printables looks odd because it's displaying negative space as positive space.
Mine came out slightly light (as shown), but that's well within the tolerance I'd expect. This was created entirely inside Prusa Slicer. The .3mf file is included and is set to 98% infill. Getting this to 1lb was done using Prusa Slicer's filament usage estimator while changing variables such as size and infill.
NOTE: This is likely less economical than buying a cheaper set of fractional weights. At current rate, 2.2lb of inexpensive filament costs about $20, meaning the net costs of printing 2 1lb weights is roughly the cost of purchasing pre-made ones, if not more expensive.
The author hasn't provided the model origin yet.