Step 07.4 — Trace the B belt path¶
Step 4 of 39 · Chapter 07 — A/B belts and tensioning
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Parts: none.
Do: Trace on p.127: X carriage → left XY joint teeth-on → left Y forward → front-left idler U-turn → B drive S-wrap → rear extrusion → rear-right idler stack → right Y forward → right XY joint smooth → carriage.
Check
You can say which XY joint B turns first, the left, and which face it shows there, teeth. Never wrap both belts on one pulley.
What you're looking at
The B belt is A's mirror image, driven by the rear-left motor in the lower plane: two runs on the left, one on the right. Each drive unit carries a toothed motor pulley for its own belt and a plain stack for the other.
Source: Voron manual p.127