This is an adapter for a Three Legged Thing tripod to allow it to have a flat-base and hooks for zip ties and strap down flat bottomed objects.

In this example, it is used for holding a scope to the tripod and doing a tracking test. It works very well forward/back, up down, and in twist, but has very little support for side-to-side rotation.

I printed mine .3mm/draft setting out of PLA, with the X dimension at 40mm. 39mm is also doable, but by 42mm or so, you won't be able to get the trapezoid section into the clamp and below 38mm the clamp won't close enough to grab the adapter.

I did 60% infill, but that was very generous.

Prusa

I3 MK3S

No

Yes

0.3

60%