1/2" hex nut fidget spinner
thingiverse
These compact and heavy basic spinners are exactly what you've been looking for! Made with Tinkercad, this thing can be edited online at https://www.tinkercad.com/things/lofV8abxcLU. Thick Caps are a cupped and thickened remix of http://www.thingiverse.com/thing:1848330 by idnarbjm. Print caps with support using these settings: Printer - Prusa MK2 and Wanhao i3 Plus; Rafts - No; Supports - No; Resolution - .20; Infill - 30%. Notes: I like to slice these with "fast honeycomb" infill in S3D, using 0 layers for top and bottom to show the infill pattern (see pictures). You can also print with solid top and bottom if you prefer. 1/2" hex nuts and 608 bearings fit tight but may need a little effort, heat from a heat gun or hot water to press into place. Scale X and Y slightly for best fit depending on your printer and material. I buy cheap 608 bearings and work in a bit of WD40 to make them spin great.
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