What size radius should I make for the slot for an aluminum block

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Standard clearance hole for M3 screw is You might use half that for your slot radius

2 Throat dimensions are basic When slots are intended to be used for holding only, tolerances can be + inch or H12 Metric ; Apart from the flex PCB, the minimum size slots on PCBs have a slot width of and a slot length of Normally, a rigid-flex board and a plain rigid

big bass amazon slot Standard drop-in T-nuts can be loaded from the side or end of a T-slot profile, making it an ideal fastener for 8020 builds with hard-to-access ends  Standard Metric T-Slots ; M5, 6, 11 - ; M6, 8, - 16 ; M8, 10, 16 - 18 ; M10, 12, 19