OGDonutGrip - Original custom foregrip CaptainSlug was awesome enough to make for me on a whim.
DonutGrip_Tuned - My edits to the foregrip based off mostly preference and a bit of considerations for print tolerances.
Same dealio as most Caliburn-U parts; recommended 1.5mm-2mm wall/floor/roof thickness, infill won't be super important due to shape being fairly thin but I'd say at least 15%.