3xD 1.1-rc1 release notes
10 November 2026 · Release candidate · Pending approval
3xD 1.1-rc1 builds on 1.0-rc2 with wider lower side-spring pockets in the two long side rails. Each pocket is enlarged by 5 mm in diameter, with a wider surrounding shoulder to retain the rim thickness.
What changed from 1.0-rc2?
- Pocket floor diameter: 5.7 mm → 10.7 mm.
- Pocket opening diameter: 6.8 mm → 11.8 mm.
- Outer shoulder width across flats: 10.8 mm → 15.8 mm.
The pockets retain their taper and 2.35 mm depth. Their floors remain 9.55 mm above the chassis top, on the same spring axes. The surrounding shoulder blends into the existing rail.
What stays the same?
Rail mounting points, screw pilots, battery interfaces and spring seating height are unchanged. The upper P2 cups, continuous cross-brace, springs and chassis-specific pod and bearing arrangements are retained.
Both chassis setups use the same local replacement rail geometry. The lower seat is at Z=12.55 mm for the 3 mm GRP chassis and Z=13.55 mm for the 4 mm printed chassis, measured from the chassis underside. Reference installed spring lengths remain unchanged.
Upgrading from 1.0-rc2
Replace both lower side rails: one left and one right. This candidate provides separate named GRP and printed-chassis update packs, containing the two replacement rails and their validation records. Use them with the matching complete 1.0-rc2 base inventory; these are changed-part packs, not a complete car release.
Print flat underside down. The baseline guidance is PLA at 0.16 mm layer height without supports; inspect the slicer preview for your printer. Re-slice the new STLs because earlier rail files and G-code still contain the smaller pockets.
Validation and remaining fit checks
Both exported rails passed checks as closed, consistently wound single solids. The taper and closed pocket floor were checked, along with the nearby screw pilot and its roof. Geometry comparisons confined changes to the rear shoulder area. Five static adjustment positions were checked for each chassis setup against the spring envelope, upper P2 cup and cross-brace.
Physical seating is still pending. The existing spring’s lower outside diameter is 5.4 mm, so the enlarged floor provides 5.3 mm nominal diametral clearance. Check that the spring remains seated through actual suspension movement; additional clearance does not itself establish better retention.
Each shoulder extends 2.5 mm farther outwards, giving an overall width of 120.8 mm across the outer shoulders. Check the real body-shell clearance. Full articulation and running durability remain physical checks.
This candidate remains pending owner approval and depends on the 1.0-rc2 baseline, which also remains pending. No printing or release approval is implied by publication of these notes.