Ch 0520 / 48
Step 05.20 — Check flush and notch orientation¶
Step 20 of 48 · Chapter 05 — Gantry: X and Y axes, XY joints, X carriage, titanium backers
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Parts: none.
Do: Sight the joint from the end: the plastic must sit flush with the end face. A wrong-hand idler will not, so take it off rather than pulling it down with bolts. The clip's notch points away from the idler assembly.
Check
Plastic flush to the extrusion end, clip notch pointing away from the idler assembly.
What you're looking at
The two front idlers are handed, different parts not mirrored copies: their lower frames differ by 10 mm to match the belt planes. Plastic flush to the end face means the right hand. The clip's notch is the indent that grips the belt.
Source: Voron manual p.92 · Video: Part 4 @0:08:32