Step 07.18 — B belt: run forward and U-turn at the front-left idler¶
Step 18 of 39 · Chapter 07 — A/B belts and tensioning
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Parts:
- the B belt · already on the bench
Do: Run the belt forward along the left Y extrusion to the front-left idler. Wrap it 180° round the idler bearing stack, smooth back on it, and bring it rearward on the outer run, parallel to the run you just made.
Check
Two parallel, non-touching runs on the left side. Smooth back on the idler, teeth away from it on both runs: inboard outbound, outboard returning.
What you're looking at
The 180° turnaround at the front-left idler, which gives the left-hand side its two parallel runs. The mirror of A's front-right turn: the smooth back rides the stack and the teeth face away from it. For B it comes early in the loop.
Tip
If the stack will not take the belt, remove that idler's M3×40 SHCS tensioner screw, thread the belt, refit, then redo Step 07.5. No drive or joint has that screw.
Source: Voron manual p.136