AUTOCHESS / MECHANICAL OPTION / 2026-10-24

A shallow case, one crossbeam

Use a flat structural base and printed perimeter, with two stationary motors and the same CoreXY XY routing. Remove the extrusion box and nest the bridge between the guide end brackets.

80 mm targetDefault assumed motor: 34 mm body / 24 mm shaft

580 mmInstalled 2020 extrusion: one moving crossbeam

720 × 630 mmFootprint allowance; 700 × 600 top / 400 × 400 grid

Structure and motion

Top view. Rails fasten to a flat base. Pale chess squares show position only; the top can be faded out.

Magnet X Bridge Y

Show playing grid Show reference belt routes

Structural baseSteel guidesOne 2020 beamCoil

The belt tangents are reused from the existing XY model. Their new vertical levels, fasteners and bracket shapes still need CAD clearance checks.

Height budget

Enter the owned motor dimensions. These are assumptions for an envelope study, not automatic changes to printable CAD.

Motor body length, mmProtruding shaft length, mmStructural base thickness, mmTop + underside cover, mm

Projected envelopes from different XY locations are shown alongside one another. The grey bar at the right is the 140 mm reference, at the same scale. Drawn mounts are schematic, not manufacturable parts.

Envelope above base	mm

What changes

Current reference	Shallow chassis option
Two extrusion rectangles and four upright extrusions	One 6–9 mm plywood base with segmented printed walls/corners
Two 500 mm extrusion rail supports with side-mounted guides	Face-up Y guides attached to the base with locating pads/templates
580 mm 2020 bridge plus tall carriage/magnet mounting stack	Retain just the 580 mm bridge, nest it between the end brackets, shorten the carriage and magnet mount
Belt hardware below the guides and deep hanging carriage skirts	Two belt levels above the bridge; new short carriage anchors and end brackets
Electronics beneath the mechanism	Perimeter bay outside the sweep, or an external box for large owned drivers

Installed 2020 length: 6.98 m Proposed: 0.58 m

About 92% less installed extrusion length. This is not a weight, price or rigidity prediction; the base, walls and new fasteners also need accounting.

What must be verified before this becomes a build option