Self-winding spoolholder

Requirement

Problem

Users want cleaner spool behavior around a multi-slot passive feed path.

Why now

Useful after core buyer onboarding because it reduces support friction around spool drag and slack management.

Exact requirement

Design a printable spoolholder that maintains light rewind tension without adding powered electronics to MechAMS.

Compatibility

MechAMS A1 reference release first; A1 Mini only after its slot row and spool path are measured.

Release Gate

Validated with full-slot feed paths, low-friction spools, and no false pulls during unload.

Acceptance criteria

• Keeps spool slack controlled without pulling filament out of the active slot path.
• Works with the recommended rear spool placement and full toolhead travel.
• Does not add electronics or imply a powered feeder.

Launch assets

• One installation photo showing spool position relative to the topbar slot row.
• A short load/unload proof clip.
• A compatibility note listing spool sizes tested.

Prototype Plan

Prototype a passive spring or gravity rewind stand behind the printer, then test it with left, middle, and right slot feed paths during load and unload.

Next build steps

• Start with one passive spring or gravity rewind stand behind the A1.
• Run left, middle, and right slot load/unload tests with empty and half-full spools.
• Compare unload reliability with and without the rewind accessory.

Measurements needed

• Supported spool outer diameter and width range.
• Distance from rear topbar slot row to spool centerline.
• Maximum acceptable rewind force before the slot path back-drives.

Safety Boundaries

• Must not pull filament out of the selected slot during unload.
• Must not add powered feed behavior or electronics to the passive MechAMS system.
• Must leave enough PTFE slack for full A1 bed and toolhead travel.

Evidence source

Instagram social archive includes a direct request for self-winding spool stands.