connector: improve thread holes

- add epsilon to prevent precise surface overlap (improves rendering)
- add sink hole for nut and screw head

1 files changed, 8 insertions, 0 deletions

diff --git a/parameters.scad b/parameters.scad
index 6fad0e7..388be89 100644
--- a/parameters.scad
+++ b/parameters.scad
@@ -51,4 +51,12 @@ pla_epsilon = 0.1;
 tray_height = hdd_height + max(cooling_height, 2 * bar_thickness + 10 * pla_epsilon);
 tray_width = hdd_width + bar_thickness;
 
+/// OPENSCAD HACKS
 
+// a length larger than any constructed feature; use to simulate
+// infinitely long structures (for difference operations)
+large = 1000;
+
+// A small quantity that does not change the print results. Use to
+// displace surfaces of CSG operations to prevent them from overlapping.
+epsilon = 0.0001;