// -*- C -*- jig_max_len = 160; // print diagonally //jig_max_len = 30; registrationgroove_width = 0.8; registrationgroove_depth = 1.2; registrationprotrusion_poke = 3; registrationprotrusion_slope = 0.75; jig_overlap = 1; jig_ends_extra = 2; jig_iters = floor((jig_max_len - jig_ends_extra) / jig_interval); //jig_iters=2; echo(jig_iters); module RegistrationGroove(l){ // runs along the +ve X axis for length l but at correct z pos translate([0, 0, jig_main_zsz + 0.1]) { rotate([90,0,90]) linear_extrude(height=l) polygon([[-registrationgroove_width/2, 0], [ +registrationgroove_width/2, 0], [ 0, -registrationgroove_depth ]]); } } module OneJig(){ difference(){ translate([-(jig_interval/2 + jig_overlap), jig_min_y, -strap_thick]) cube([jig_interval + 2, jig_max_y - jig_min_y, jig_main_zsz + strap_thick]); OneJigCutout(); translate([-100, -strap_width/2, -10]) cube([200, strap_width, 10]); translate([-100,0,0]) RegistrationGroove(200); for (xfrac=[-1/4,0,+1/4]) translate([jig_interval * xfrac, -100, 0]) rotate([0,0,90]) RegistrationGroove(200); } } module RegistrationProtrusion(){ // points towards the positive x axis xsz = registrationprotrusion_poke; ysz = registrationprotrusion_poke; diag_sz = xsz * sqrt(2); zsz = diag_sz / registrationprotrusion_slope; hull(){ translate([0, 0, 0.1]){ linear_extrude(height=0.1) polygon([[ 0, -ysz ], [ xsz, 0 ], [ 0, ysz ]]); translate([-0.1, 0, zsz ]) rotate([0,0,45]) cube(0.1); } } } module Jig(){ for(end=[0,1]){ for(yfrac=[-1/2, 0, 1/2]){ translate([ end ? jig_interval * (jig_iters - 0.5) : -jig_interval/2, yfrac * strap_width, 0]) rotate([0,0, end ? 0 : 180]) translate([ jig_overlap, 0, 0 ]) RegistrationProtrusion(); } } for (i=[0:jig_iters-1]) { translate([jig_interval * i, 0, 0]) OneJig(); } } module JigPrint(){ rotate([0,0,-45]) translate([0,0,jig_main_zsz]) rotate([180,0,0]) Jig(); }