+// todo
+// various registration marks
+// protrustions at ends at strap width and middle
+// grooves on top face at 1/4,1/2,3/4 length and 1/2 width
+
+crewpunch_slop = 0.3;
+
+holder_min_wall = 2;
+holder_attach_near_wall = 3;
+
+holder_attach_xsz = 5;
+holder_ctie_width = 4.0 + 0.5;
+holder_ctie_thick = 3.0 + 0.5;
+holder_attach_walls = 3;
+holder_attach_roof = 2.5;
+
+jig_interval = 25;
+strap_width = 26.75 + 0.7;
+strap_thick = 3;
+edgewall_width = 3;
+
+punch_travel = 8;
+
+main_slop = 0.5;
+
+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;
+
+// from careful measurement
+
+crewpunch_shape =
+ [[ 6, [0.6, 6.0], [1.6, 12.3] ],
+ [ 8, [1.1, 6.2], [1.9, 12.5] ],
+ [ 10, [1.6, 6.5], [2.1, 12.8] ],
+ [ 12, [1.8, 6.6], [2.3, 12.7] ],
+ [ 14, [2.1, 6.8], [2.6, 13.0] ],
+ [ 16, [2.4, 6.9], [2.7, 13.2] ],
+ [ 18, [2.5, 7.0], [2.9, 13.3] ],
+ [ 22, [3.1, 7.1], [3.2, 13.4] ],
+ [ 26, [3.3, 7.2], [3.5, 13.6] ],
+ ];
+
+crewpunch_shaft_max_y = 7.5;
+
+crewpunch_systematic_size_error = +0.36;
+
+crewpunch_min_y = 4.7 - crewpunch_systematic_size_error;
+
+crewpunch_smallest_shape = crewpunch_shape[0];
+crewpunch_biggest_shape = crewpunch_shape[len(crewpunch_shape)-1];
+
+// computed
+
+attach_ysz = holder_attach_walls*2 + holder_ctie_width;
+holder_front_all = crewpunch_shaft_max_y - crewpunch_biggest_shape[1][1]
+ + attach_ysz;
+
+holder_block_zsz = crewpunch_biggest_shape[0] - crewpunch_smallest_shape[0];
+holder_xsz = crewpunch_biggest_shape[2][1] + crewpunch_biggest_shape[2][0] +
+ holder_min_wall*2;
+crewpunch_biggest_y =
+ crewpunch_biggest_shape[1][0] + crewpunch_biggest_shape[1][1];
+holder_ysz = crewpunch_biggest_y + holder_min_wall + holder_front_all;
+
+attach_offset = 0.5 * (holder_front_all - holder_attach_near_wall);
+
+jig_main_zsz = holder_block_zsz + punch_travel;
+
+jig_ends_extra = 2;
+
+//jig_iters = (jig_max_len - jig_ends_extra) / jig_interval;
+jig_iters=2;
+echo(jig_iters);
+
+// objects
+