The Mantis 9.1 design is a radical departure from version 8 and earlier.
Most notably, the part count has been almost halved! The current design
has 13 parts, all of which can be made with a handsaw and a drill
press. Also, I’ve traded away my alignment free exactly-constrained
design for extra stiffness. Several unsuccessful attempts to eradicate
the last of the slop in the Z axis on version 8 lead me back to the
world of over-constrained parallel rods. My previous attempts at an
over-constrained design (versions 1-5) all failed because I was unable
to make the rods sufficiently parallel to avoid jamming. What to do? [Link]
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