fairphone-case: provide linextr (no callers yet, so nfc)

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/fairphone-case.scad b/fairphone-case.scad
index 00d167eb785767a9e30fd6209749ecfa8818f94c..6ed1fc4b2642fd7659519569990aee69cdb3c7c8 100644 (file)
--- a/fairphone-case.scad
+++ b/fairphone-case.scad
@@ -119,6 +119,11 @@ module rectfromto(a,b) {
     square([abs(ab[0]), abs(ab[1])]);
 }
 module circleat(c,r) { translate(c) circle(r); }
+module linextr(z0,z1) {
+  translate([0,0,z0])
+    linear_extrude(height=z1-z0)
+    children();
+}
 
 module KeeperProfile(slant=0){
   use_e = kppe + [0,-1] * slant * keeper_inner_width / keeper_slant_slope;