cap.py

import cadquery as cq

slt_dist = (11.85 + 10.35) / 2
boss_len = (11.85 - 10.35) / 2
boss_d = 0.86

def make_slot():
    slt_h, slt_d, slt_g, slt_t = 1.2, boss_d, 0.65, boss_len
    slt_w = 1.5 # guessed
    return (cq.Workplane("XZ").sketch()
            .push([(0, -slt_h / 2)]).rect(slt_w, slt_h).rect(slt_g, 10, mode="s")
            .push([(0, -slt_d / 2)]).circle(slt_d / 2, mode="s")
            .push([(0, -slt_d / 4)]).rect(slt_d, slt_d / 2, mode="s")
            .reset().vertices("<Y exc >X exc <X").chamfer(0.1)
            .finalize().extrude(slt_t / 2, both=True))

def make_slide(b):
    sld_w, sld_h, sld_t = 0.9, boss_d, boss_len

    return (cq.Workplane("XY")
            .workplane(-sld_t-0.5)
            .box(sld_w, sld_t, sld_h, centered=(False, True, False))
            .faces(f">X or {'<' if b else '>'}Y").shell(0.3, kind="intersection")
            )

cap = (cq.Workplane().sketch().rect(16.5, 16.5).vertices().fillet(1).finalize().extrude(1).faces("<Z").shell(-0.5).edges(">Z").fillet(0.2)
       .faces("<Z[1]").workplane()
       .transformed(offset=(-5, 0, 0)).rarray(1, slt_dist, 1, 2, center=True)
       .each(lambda p: make_slot().translate(p).val())
       .transformed(offset=(10.1, 0, 0)).rarray(1, slt_dist, 1, 2, center=True)
       .each(lambda p: make_slide(p.y > 0).translate(p).val()))

show_object(cap)