Lower Clamshell Base

# MANUFACTURING CONSTRAINT: All structures must be sliced and printed with Matte Black PLA or Matte Black PETG filament. Interior surfaces must feature zero specular reflectivity to ensure maximum image contrast and prevent stray light bleeding. Design a multi-part modular 35mm film projector housing system optimized for FDM 3D printing without internal support structures. The system consists of a Lower Clamshell Base, an Upper Clamshell Lid, a Focus Sleeve, a Drive Spindle, and matching Lens Retaining Rings. Part 1: Lower Clamshell Base - Geometry: The bottom half of a horizontally split enclosure measuring 65mm total width, 32.5mm height, and 150mm length with a 3mm wall thickness. External bottom longitudinal edges must have a 5mm fillet radius. - Registration Interface: The upper rim perimeter must feature a continuous 1.5mm deep by 1.5mm wide interlocking step/lip to align with the upper lid. - Rear Chamber Layout: Includes a vertical mounting channel located 15mm from the back wall to hold a standard 20mm x 20mm square LED aluminum star PCB. The lower rear wall features a 10mm x 5mm rectangular cutout for a USB-C breakout board. - Electronics Isolation: An internal light-shield wall completely isolates a 40mm x 20mm corner section around the USB-C cutout, containing a pocket for a 1S battery fuel-gauge board and small vertical channels for status LEDs. - Control Openings: The left outer side wall features two 7mm diameter circular through-holes spaced 25mm apart horizontally for rotary potentiometer shafts. - Optical Elements: Includes the lower 180-degree half-profile of a vertical condenser lens seat located 40mm from the rear wall, and the lower half of an internal M52x1mm thread. - Film Path & Crank: A horizontal film path cutout located 60mm from the rear wall measuring 35.40mm wide and 0.40mm deep with integrated 1mm deep recessed emulsion guide rails. Adjacent to the film path, include a 5mm semi-circular cradle acting as the bottom journal bearing for a film drive spindle. - Front Barrel: Terminates in a forward-facing semi-cylindrical tube with an internal diameter of 52mm, extending 30mm out, featuring an internal 1.0mm safety retention lip at its front face. - Base Anchor: The exterior bottom center features an integrated 15mm x 15mm square boss containing an internal 1/4"-20 UNC standard tripod thread hole (6.35mm diameter, 10mm deep).

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