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Reuse and redistribute as freely as possible in any form, then: - a\) Subject to the thickness of the arrow. Scale([engraved_indicator_scale * 0.3, engraved_indicator_scale * 0.3, engraved_indicator_scale * 0.3]) union() { cube([board_width, board_height, thickness]); cylinder(thickness+standoff_height, r=standoff_radius, $fn=360); cube([cutout_width, cutout_height, thickness+3]); cylinder(h=thickness+standoff_height+3, r=hole_radius, $fn=360); vertex 0 -8.99167 3 vertex -8.81921 -1.75094 3 vertex -3.44384 -8.30568 3 vertex 1.75094 8.81921 3 vertex -7.4763 -4.9955 3 vertex 7.4763 4.9955 3 vertex -5.00013 -7.48323 0 vertex 6.29579 -1.61648 19.9 facet normal -0.533428 -0.161815 0.830223 vertex -9.12468 -0.183929 3.76384 vertex 9.31122 1.59974 3.54602 facet normal 0.615699 0.52587 0.586835 facet normal -0.976261 0.0729941 0.203926 vertex -1.01854 7.22332 7.61242 vertex 4.37272 5.83103 7.67586 vertex 1.01854 7.22332 7.61242 vertex -1.03118 -7.21514 7.67586 facet normal -0.652551 -0.754471 0.0703597 facet normal 4.808466e-001 8.424486e-001 2.430369e-001 vertex 4.669177e-002 -5.847422e+000 2.470887e+001 facet normal 0.0819588 0.0819349 -0.993262 vertex 4.44467 3.03604 21.8214 vertex -4.64695 -3.15155 21.6407 facet normal 0.156434 0.987688 -0 vertex 0.487725 2.45196 6.5 vertex 2.5 0 6.5 vertex -2.07867 -1.38893 6.7 vertex 2.3097 0.956708 6.5 vertex 0.956708 -2.3097 6.7 vertex -1.38893 -2.07867 6.5 facet normal -0.618899 -0.0694573 0.782394 facet normal -0.090682 -0.920074 0.381103 facet normal 4.866829e-001 -8.343584e-001 2.588163e-001 facet normal -9.270894e-01 3.557204e-03 3.748233e-01 vertex -1.084303e+02 9.695134e+01 1.111985e+01 facet normal 0.900548 0.423258 0.0993298 facet normal -0.63066 0.768477 0.108216 facet normal -7.00605e-05 -0.11345 0.993544 vertex -0.283767 7.25453 6.90386 vertex 0.475902 7.35304 6.91509 facet normal 0.880764 -0.468299 0.0703603 facet normal 3.237573e-07 -1.000000e+00 5.846266e-07 facet normal -5.035329e-001 -3.352661e-003 8.639696e-001 vertex 4.191212e+000 1.627826e+000 2.494118e+001 facet normal -9.960546e-001 -4.761063e-003 8.861465e-002 vertex 4.034431e+000 8.058850e-001 2.470218e+001 facet normal -8.314790e-01 5.555561e-01 3.284580e-04 vertex -1.036796e+02 1.023805e+02 1.855000e+01 vertex -9.858900e+01 9.181025e+01 1.855000e+01 vertex -9.259156e+01 1.042646e+02 2.655000e+01 facet normal 0.392055 0.2628 0.881606 facet normal 0.420513 -0.174177 0.890411 facet normal -0.629688 0.768246 0.115285 facet normal -0.630625 -0.768509 0.108196 facet normal 0.880764 -0.468299 0.0703603 facet normal -0.115801 -0.000135683 -0.993272 vertex -5.40722 -0.82619 21.8351 facet normal 7.070963e-001 3.148567e-003 7.071103e-001 facet normal 0.195099 -0.980784 -7.13214e-06 vertex -0.4 3.07081 8.75682 vertex -0.4 -3.28125 18.4724 facet normal 9.172635e-01 2.089601e-02 -3.977324e-01 facet normal 9.659144e-001 4.301482e-003 2.588261e-001 facet normal -0.205763 0.678285 0.705402 facet normal 0.695453 0.464714 -0.548075 vertex 2.92724 1.22816 18.7471 vertex 3.08346 1.31835 18.4724 vertex 2.58025 1.95159 18.574 vertex -2.37646 -2.37646 18.4724 facet normal -0.0221424 0.0970097 -0.995037 facet normal -0.773012 0.634392 0 facet normal 0.0998673 0.114117 0.988435 facet normal -0.831464 -0.555578 -1.13595e-06 vertex 2.69268 2.0165 8.90669 vertex 2.57448 2.1934 6.59 facet normal -0.453756 0.0357026 0.890411 facet normal -0.219559 0.16633 0.961316 facet normal -6.013035e-01 -7.990206e-01 -3.390242e-04.

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