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Make a 2d version v_wall(h=4, l=height-rail_clearance*2, th=right_rib_thickness); // top horizontal rib // h_wall(h=1.6, l=right_rib_x); // middle horizontal rib // h_wall(h=4, l=right_rib_x); // bottom horizontal rib h_wall(h=1.6, l=right_rib_x); // middle horizontal rib // h_wall(h=1.6, l=right_rib_x); // middle horizontal rib // h_wall(h=4, l=right_rib_x); // middle-bottom h rib // h_wall(h=1.6, l=right_rib_x); // bottom horizontal rib h_wall(h=4, l=right_rib_x); // middle-bottom h rib // one more to mount a circuit outside the full dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, wide, drill 0.75mm (see NXP sot054_po.pdf TO-92 leads in-line, wide, drill 0.75mm (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92S_Wide package, drill 0.6mm (https://media.digikey.com/pdf/Data%20Sheets/Infineon%20PDFs/KT,KTY.pdf TO-92S package, 2-pin, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot487-1_po.pdf HTSSOP, 38 Pin (JEDEC MO-153 Var CD https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for a single 2.5 mm² wires, reinforced insulation, conductor diameter 0.65mm, outer diameter 3.5mm, hole diameter 1.2mm, length 11.3mm, width 2.8mm solder Pin_ with flat with fork, hole diameter 0.9mm, outer diameter 2.3mm, size source Multi-Contact FLEXI-xV 2.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Mounting Hardware, inside blind hole M1.6, height 4, Wuerth electronics 9774015951 (https://katalog.we-online.de/em/datasheet/9774015951.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 2 times 0.127 mm² wires, reinforced insulation, conductor diameter 0.65mm, outer diameter 1mm, size source Multi-Contact FLEXI-xV 1.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Samtec HLE .100.

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