Modified the end effector, moving the leveling screws to the side and adding cable routes across the bottom so it can sit flat.  This should simplify leveling the end effector significantly.

Previously the leveling screws were on the bottom.  Getting a screwdriver under there meant the end effector was up in the air, without a reference, while you locked the leveling in place.  This will be better.

If all goes as planned, you should be able to loosen the screws, plop it down flat on the bed, and tighten them again and be perfectly level.

For this version I also added a switch which enables/disables the fan mount and drops the ribbon cable guide for the Pi camera used on the P1 in its place.  I also added another optional guide to the pushrod joint to match and reshaped the existing guide to pass the 3 pin servo plugs through.

<EDIT> Since this, I have also moved the virtual pulleys up to be on the same level as my pushrod gimbal.  Here you can see the new cable slots also.

It's on the P1 now, and working like a charm.

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