Printed frame surrounding round glass, to be attached with clear tape…

…. This should prevent sideways wobble of the print surface but allow precise FSR autolevel.

Makefile

@@ -1,6 +1,6 @@
 all: frame_top.stl frame_motor.stl carriage.stl endstop.stl glass_tab.stl \
 effector.stl retractable.stl power_supply.stl extruder.stl frame_extruder.stl \
-m5_internal.stl plate_3x.stl plate_1x.stl \
+glass_frame.stl m5_internal.stl plate_3x.stl plate_1x.stl \
 switch_holder.stl hotend_fan.stl
 
 .SECONDARY:

glass_frame.scad

@@ -0,0 +1,51 @@
+include <configuration.scad>;
+
+fsr_height = 1.0;
+height = 25.4 / 4 + fsr_height;
+glass_radius = 172 / 2;
+outside_radius = glass_radius * 1.15;
+triangle_radius = glass_radius * 2.13;
+
+module curve_slot(r, h) {
+  linear_extrude(h) minkowski() {
+    union() {
+      circle(r=r, h=2*height, center=true, $fn=12);
+    }
+    intersection() {
+      square([16, 3*glass_radius], center=true);
+      difference() {
+        circle(r=glass_radius+6.1, $fn=120);
+        circle(r=glass_radius+6, $fn=120);
+      }
+    }
+  }
+}
+
+module glass_frame() {
+  difference() {
+    linear_extrude(height=height) {
+      difference() {
+        intersection() {
+          rotate([0, 0, 30]) circle(r=triangle_radius, $fn=3);
+          circle(r=outside_radius, $fn=120);
+        }
+        circle(r=glass_radius, $fn=120);
+        for (a = [0:120:359]) {
+          rotate([0, 0, a]) translate([0, glass_radius])
+            square([glass_radius*0.6, glass_radius], center=true);
+        }
+        translate([0, glass_radius / 2])
+          square([2*triangle_radius, triangle_radius], center=true);
+      }
+    }
+    for (a = [-35, 35]) rotate([0, 0, a]) {
+	  translate([0, 0, -height/2]) #
+        curve_slot(r=m3_wide_radius, h=2*height);
+	  translate([0, 0, thickness]) #
+        curve_slot(r=3, h=2*height);
+    }
+  }
+}
+
+translate([0, 0, height/2])
+glass_frame();