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Shown on a handle, not a hook. Work in your V2 (Save V1 as V2 shows how). Ctrl+1, then Down arrow twice, Left arrow once and F to fit. An inside corner is where the outline turns in. This handle has 8.

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A sharp inside corner multiplies the stress there, and a printed hook is brittle enough that one sharp corner can start the break.

What you should seeThe part tilts so you look down on the small ledges where each leg meets its foot and the arch.
- Fillets overview(opens in a new tab)

Round the inside corners