From d7c7274170dc4dc3704e5b88c76d44ca9d9cbd83 Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Tue, 24 Jan 2023 02:39:41 +0100
Subject: helper functions

---
 gridfinity.scad | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'gridfinity.scad')

diff --git a/gridfinity.scad b/gridfinity.scad
index c67fe3c..d4cf924 100644
--- a/gridfinity.scad
+++ b/gridfinity.scad
@@ -8,6 +8,7 @@ width_tolerance    = 41.5;
 rounding = 3.75;
 
 minimal_thickness = 1.5;
+wall_thickness = 2.95; // thickness of stacking lip
 
 // Get top of GridFinity object from GF units
 function gf_top(units_z) =
@@ -26,6 +27,11 @@ function flatten(l) = [ for (a = l) for (b = a) b ] ;
 function gf_top_center(units_x, units_y, units_z) =
   flatten([gf_center(units_x,units_y),gf_top(units_z)]);
 
+function gf_inner_origin() = [-20.75 + wall_thickness,-20.75 + wall_thickness];
+
+// usable inner space
+function gf_inner(units_l) = 42*units_l -1 - 2*wall_thickness;
+
 module rounding(r,angle) {
   rotate(angle,[0,0,1])
   translate([-r + 0.01, -r + 0.01])
@@ -172,7 +178,6 @@ module gridfinity(units_x, units_y, units_z, lip = true, magnets = false, fill =
 
       // remove solid block if set, leave walls
       if (! fill) {
-        wall_thickness = 2.95; // thickness of stacking lip
         extr = units_z * height - (4.75 + minimal_thickness) - bottom_height + 0.01;
 
         translate([coord_centered(units_x), coord_centered(units_y), 4.75 + minimal_thickness + bottom_height])
-- 
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