Bicycle Front Mounting Adapter Plate

Create a 3D-printable bicycle front mounting adapter plate, 180 mm long (X-axis) and 80 mm wide (Y-axis), with a completely flat bottom face at Z=0. From X=0 mm (rear edge near the head tube) to X=30 mm, create a thick rectangular mounting block 14 mm tall (Z=0 to Z=14 mm). From X=30 mm to X=180 mm (front support plate under the cargo box), create a flat plate 6 mm tall (Z=0 to Z=6 mm). Add a 4 mm concave fillet along the inner corner at X=30 mm, Z=6 mm where the vertical step meets the thinner plate. Drill two vertical through-holes of 6.4 mm diameter through the thick block at X=10 mm (only 10 mm from the rear X=0 edge, leaving 20 mm ahead of the holes to the step at X=30 mm), positioned symmetrically at Y=10 mm and Y=70 mm (60 mm center-to-center across the 80 mm width). Clean manifold geometry, completely flat bottom, suitable for FDM 3D printing on its side without supports.; then round the edges a bit

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