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Hi dethcookie, sorry to hear the pegs/sockets are so loose. We have a
Replicator 1 and usually print in ABS, maybe the Replicator 2 and PLA is
producing more accurate prints and my model needs tweeking.

As a
test, I've increased the peg radius from 2.7mm to 2.85 and created a
new set of STLs - they're in "TIGHTER_TRILOBITE.ZIP". (The socket radius
is still 3.08mm.)

You can quickly check if the new pegs work by
printing "pegs_TEST.STL" - it's just four of the peg & socket units
without ribs. If they fit together, then I'd be very grateful if you'd
try a complete print.

Fingers crossed...