Extruder Test Jig

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Problem Statement

How do you measure the pull force of the extruder?

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Results

Minimum acceptable pull force is 5 lb. Tighten extruder spring if this is not the case. Make sure 33 mm long spring is used. Motor skipping indicates limit. If motor skips before 5 lb, verify that motor current is sufficient. Sometimes filament slipping is a limit, in which case the extruder spring force must be improved. Slight optimization needed there to add 1-2 mm of spring tension by making extruder spring mounting holes more shallow, or design them differently so spring is easier to remove.

  • May 22, 2020 - 5.5 lb pull force. Notice small 3 mm spacer inside the extruder spring hole.

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External Links

  • Any tests out there of other extruders?