diff --git a/ROCK64.stl b/ROCK64.stl
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diff --git a/ROCK64_OSD.scad b/ROCK64_OSD.scad
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+// Case for a "Ceph OSD" from ROCK64 + 3.5" HDD + USB3.0-SATA UASP :)
+
+// Version 1, simplest
+
+// From WD datasheet: https://support.wdc.com/images/kb/2579-771970-A03.pdf + https://www.techpowerup.com/forums/attachments/3_5_emount-jpg.44813/
+hdd35_w = 95.25;
+hdd35_l = 147;
+hdd35_h = 26.1;
+hdd35_screw1_offset = 28.5; // from connector side
+hdd35_screw2_offset = 28.5+41.61; // from connector side
+hdd35_screw3_offset = 28.5+101.6; // from connector side
+hdd35_screw_zpos = 6.35; // from bottom
+hdd35_screw_dia = 3.51; // 6-32 screws
+
+// From ROCK64 drawings: https://github.com/TeaPackCZ/Rock64_drawings/blob/master/Rock64 Base.pdf
+rock64_w = 56.2;
+rock64_l = 88;
+rock64_h = 17; // +2mm under for microsd slot
+rock64_board_thick = 1.5;
+rock64_screw_offset = 3.6; // from back and edges
+rock64_screw_distance = 58; // from back screws to front screws
+rock64_screw_dia = 2.8; // weird screws
+
+rock64_zpos = 16;
+rock64_screw_post_dia = 6;
+
+// 3.5 HDD and screws
+color([0.8, 0.6, 1]) cube(size=[hdd35_w, hdd35_l, hdd35_h]);
+color([1, 0.5, 0.5]) translate([0, -rock64_w, 0]) cube(size=[hdd35_w, rock64_w, 13]);
+color([1, 1, 1]) translate([ 0, hdd35_screw1_offset, hdd35_screw_zpos ]) rotate([0, -90, 0]) cylinder(r=hdd35_screw_dia/2, h=3, $fn=32);
+color([1, 1, 1]) translate([ 0, hdd35_screw2_offset, hdd35_screw_zpos ]) rotate([0, -90, 0]) cylinder(r=hdd35_screw_dia/2, h=3, $fn=32);
+color([1, 1, 1]) translate([ 0, hdd35_screw3_offset, hdd35_screw_zpos ]) rotate([0, -90, 0]) cylinder(r=hdd35_screw_dia/2, h=3, $fn=32);
+color([1, 1, 1]) translate([ hdd35_w, hdd35_screw1_offset, hdd35_screw_zpos ]) rotate([0, 90, 0]) cylinder(r=hdd35_screw_dia/2, h=3, $fn=32);
+color([1, 1, 1]) translate([ hdd35_w, hdd35_screw2_offset, hdd35_screw_zpos ]) rotate([0, 90, 0]) cylinder(r=hdd35_screw_dia/2, h=3, $fn=32);
+color([1, 1, 1]) translate([ hdd35_w, hdd35_screw3_offset, hdd35_screw_zpos ]) rotate([0, 90, 0]) cylinder(r=hdd35_screw_dia/2, h=3, $fn=32);
+
+// ROCK64
+color([0.6, 0.8, 1]) translate([rock64_l/2+1, -rock64_w/2-3, rock64_zpos]) rotate([-90, 180, 90]) import("./ROCK64.stl");
+
+color([0, 0.8, 0.5]) {
+    translate([rock64_screw_offset+2.4, -rock64_screw_offset-3, rock64_zpos+rock64_board_thick]) difference() {
+        cylinder(r=rock64_screw_post_dia/2, h=rock64_h, $fn=32);
+        translate([0, 0, -1]) cylinder(r=1.45, h=10, $fn=32);
+    }
+    translate([rock64_screw_offset+2.4, -rock64_w+rock64_screw_offset-3, rock64_zpos+rock64_board_thick]) difference() {
+        cylinder(r=rock64_screw_post_dia/2, h=rock64_h, $fn=32);
+        translate([0, 0, -1]) cylinder(r=1.45, h=10, $fn=32);
+    }
+    translate([rock64_screw_distance+rock64_screw_offset+2.4, -rock64_screw_offset-3, rock64_zpos+rock64_board_thick]) difference() {
+        cylinder(r=rock64_screw_post_dia/2, h=rock64_h, $fn=32);
+        translate([0, 0, -1]) cylinder(r=1.45, h=10, $fn=32);
+    }
+    translate([rock64_screw_distance+rock64_screw_offset+2.4, -rock64_w+rock64_screw_offset-3, rock64_zpos+rock64_board_thick]) difference() {
+        cylinder(r=rock64_screw_post_dia/2, h=rock64_h, $fn=32);
+        translate([0, 0, -1]) cylinder(r=1.45, h=10, $fn=32);
+    }
+    difference()
+    {
+        union() {
+            translate([-5, -rock64_w-10, 0]) cube(size=[5, rock64_w+10+hdd35_l+5, rock64_zpos+rock64_board_thick+rock64_h]);
+            translate([-5, -rock64_w-10, rock64_zpos+rock64_board_thick+rock64_h]) cube(size=[10+hdd35_w, rock64_w+10+hdd35_l+5, 2]);
+            translate([hdd35_w, 0, 0]) cube(size=[5, hdd35_l+5, rock64_zpos+rock64_board_thick+rock64_h]);
+            translate([0, hdd35_l+1, 0]) cube(size=[hdd35_w, 5-1, rock64_zpos+rock64_board_thick+rock64_h]);
+        }
+
+        translate([ 0, hdd35_screw1_offset, hdd35_screw_zpos ]) rotate([0, -90, 0]) cylinder(r=hdd35_screw_dia/2, h=10, $fn=32);
+        //translate([ 0, hdd35_screw2_offset, hdd35_screw_zpos ]) rotate([0, -90, 0]) cylinder(r=hdd35_screw_dia/2, h=10, $fn=32);
+        translate([ 0, hdd35_screw3_offset, hdd35_screw_zpos ]) rotate([0, -90, 0]) cylinder(r=hdd35_screw_dia/2, h=10, $fn=32);
+        translate([ -1, hdd35_screw1_offset, hdd35_screw_zpos ]) rotate([0, -90, 0]) cylinder(r=hdd35_screw_dia/2+2, h=10, $fn=32);
+        //translate([ -1, hdd35_screw2_offset, hdd35_screw_zpos ]) rotate([0, -90, 0]) cylinder(r=hdd35_screw_dia/2+2, h=10, $fn=32);
+        translate([ -1, hdd35_screw3_offset, hdd35_screw_zpos ]) rotate([0, -90, 0]) cylinder(r=hdd35_screw_dia/2+2, h=10, $fn=32);
+
+        translate([ hdd35_w, hdd35_screw1_offset, hdd35_screw_zpos ]) rotate([0, 90, 0]) cylinder(r=hdd35_screw_dia/2, h=10, $fn=32);
+        //translate([ hdd35_w, hdd35_screw2_offset, hdd35_screw_zpos ]) rotate([0, 90, 0]) cylinder(r=hdd35_screw_dia/2, h=10, $fn=32);
+        translate([ hdd35_w, hdd35_screw3_offset, hdd35_screw_zpos ]) rotate([0, 90, 0]) cylinder(r=hdd35_screw_dia/2, h=10, $fn=32);
+        translate([ hdd35_w+1, hdd35_screw1_offset, hdd35_screw_zpos ]) rotate([0, 90, 0]) cylinder(r=hdd35_screw_dia/2+2, h=10, $fn=32);
+        //translate([ hdd35_w+1, hdd35_screw2_offset, hdd35_screw_zpos ]) rotate([0, 90, 0]) cylinder(r=hdd35_screw_dia/2+2, h=10, $fn=32);
+        translate([ hdd35_w+1, hdd35_screw3_offset, hdd35_screw_zpos ]) rotate([0, 90, 0]) cylinder(r=hdd35_screw_dia/2+2, h=10, $fn=32);
+    }
+}