I adapted my replacement Quest 2 Elite Strap I previously made to be used with Quest 3. I maximised the Prusa MK3 bed length so its one piece print. I also made the interface to perfectly fit the convex Quest 3 arm. I highly recommend printing using PETG and then bending it with headgun on the pot technique so it will have the same shape as the original strap.
Bending the printed strap arm with heatgun + old pot:
1. Use old pot with shape close to curvature of original strap. Heat evenly from the distance part highlighted in red below
2. After a while plastic will become soft and fall on the pot's surface like below:
3. Try not to move as plastic cools down. Done perfectly shaped strap
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The author marked this model as their own original creation.