Step 07.2 — Learn the rule that governs this chapter¶
Step 2 of 39 · Chapter 07 — A/B belts and tensioning
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Parts: none.
Do: Read p.125. The two belt paths are stacked at different heights and never cross: each belt stays in one horizontal plane for its entire loop. Equal length is how you get equal tension.
Check
You can state, without looking, where the A belt leaves the carriage and where it comes back.
What you're looking at
The concept page. In CoreXY neither motor owns an axis: two belt loops connect both motors to the carriage. The toolhead moves in X when the motors turn together, in Y when they turn opposite ways. Both paths are the same length by design.
Source: Voron manual p.125