Knob cup primary

Closed cup that pushes up over the fluted knob from below; its bottom skirt is the female half of the O-ring slip clutch. Round 5 gave the rim a bullnose (the knife edge noted in the print plan is fixed).

Download STL (448 KB, binary)

File

hardware/stl/knob_cup_coupler_cup.stl

Bounding box

20.06 × 20.06 × 33.00 mm (X × Y × Z, as exported; Z up from the bed)

Volume

4.76 cm³; ≈ 6.0 g if printed solid in PETG (real mass depends on walls and infill)

Mesh

9,172 triangles

Material

PETG, matt white

Layer

0.12-0.16 mm

Walls / infill

4 walls, 40 % gyroid

Orientation

As exported: clutch-bore end down, mouth up.

Supports / brim

None (the floor bridges the 11.4 mm clutch bore). No brim.

Quantity

1 per head

Versions

ABCD

See it in the assembly →

Print settings are starting points from ASSEMBLY.md and the print plan, not values tested on this design. Dimensions that depend on the knob, rod or clip are estimated from photo, not caliper.