[imrishabh18]

The NEMA23 rear previously reused the front flange's nearly square outline and square fastener pattern. Define a curved rear cap with a 50 × 32 mm rectangular rear pattern, R5 concave recesses, and R2.5 outer fillets. The default body now follows that same curved outline, so the rear shoulders do not protrude beyond an octagonal body. The front flange, mounting holes, pilot, shaft, and body envelope remain unchanged.

Paired renderer: tscircuit/jscad-electronics#503

Add independent rear X/Y spacing, rear profile selectors, and configurable body/rear arc radii. Existing scalar rear spacing still sets both axes. Keep the former body and rear depiction available with nema23_chamfered_backholespacing47.14mm_backscrewm4. Other frame defaults retain their current shapes.

Validate rear bores and screw heads against the actual straight edges and curved shoulders, and validate the entire front through-hole radius against the body profile. Wire references follow the selected outline. The shared analytic checks do not introduce renderer dependencies.

The rear profile and pattern use STEPPERONLINE's ST-M10 rear-adapter drawing as a representative reference. The motor retains its 56.4 mm envelope and uses illustrative M3 socket screws. That adapter drawing does not establish exact motor threads, screw style, or rear-cover radii; these defaults are not universal NEMA23 dimensions. Matching body/rear shoulders follows the motor-photo reference.

Validation with Bun 1.4.3: all 307 tests, type checking, formatting, and package build passed. Tests cover schema roundtrips, default/legacy selections, independent dimensions and radii, full-circle clearance, and diagonal wire references. Visual snapshots and geometry validation belong in the paired renderer PR.

[tscircuitbot]

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