diff --git a/knoopvoet/go.mod b/knoopvoet/go.mod
new file mode 100644
index 0000000..04fb769
--- /dev/null
+++ b/knoopvoet/go.mod
@@ -0,0 +1,8 @@
+module knoopvoet
+
+go 1.16
+
+require (
+	git.wtrh.nl/3D-models/objects v0.0.0-20210528131644-78f3aae2fba3
+	github.com/deadsy/sdfx v0.0.0-20210428225541-69bac33c47f0
+)
diff --git a/knoopvoet/go.sum b/knoopvoet/go.sum
new file mode 100644
index 0000000..67a92e8
--- /dev/null
+++ b/knoopvoet/go.sum
@@ -0,0 +1,21 @@
+git.wtrh.nl/3D-models/objects v0.0.0-20210528131644-78f3aae2fba3 h1:drRM0nTPLRIVUwdfxCaUrEBJFDgzIxFsIttW6gGCbr8=
+git.wtrh.nl/3D-models/objects v0.0.0-20210528131644-78f3aae2fba3/go.mod h1:YYSLQ70RNqjnLBLk/rimXyxYzMORHlREwok9g2ZQv/c=
+github.com/ajstarks/svgo v0.0.0-20200725142600-7a3c8b57fecb h1:EVl3FJLQCzSbgBezKo/1A4ADnJ4mtJZ0RvnNzDJ44nY=
+github.com/ajstarks/svgo v0.0.0-20200725142600-7a3c8b57fecb/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw=
+github.com/deadsy/sdfx v0.0.0-20210428225541-69bac33c47f0 h1:nCkBC+PowWnmkCMe+3cCOtxpNVw+R1TQI8hzmCmPyKI=
+github.com/deadsy/sdfx v0.0.0-20210428225541-69bac33c47f0/go.mod h1:abZaCad/jNP8KcO+XMyLX6C/cZOdnwefasReJEva4cE=
+github.com/go-gl/gl v0.0.0-20180407155706-68e253793080/go.mod h1:482civXOzJJCPzJ4ZOX/pwvXBWSnzD4OKMdH4ClKGbk=
+github.com/go-gl/glfw v0.0.0-20180426074136-46a8d530c326/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+github.com/jung-kurt/gofpdf v1.0.0/go.mod h1:7Id9E/uU8ce6rXgefFLlgrJj/GYY22cpxn+r32jIOes=
+github.com/llgcode/draw2d v0.0.0-20200930101115-bfaf5d914d1e h1:YRRazju3DMGuZTSWEj0nE2SCRcK3DW/qdHQ4UQx7sgs=
+github.com/llgcode/draw2d v0.0.0-20200930101115-bfaf5d914d1e/go.mod h1:mVa0dA29Db2S4LVqDYLlsePDzRJLDfdhVZiI15uY0FA=
+github.com/llgcode/ps v0.0.0-20150911083025-f1443b32eedb h1:61ndUreYSlWFeCY44JxDDkngVoI7/1MVhEl98Nm0KOk=
+github.com/llgcode/ps v0.0.0-20150911083025-f1443b32eedb/go.mod h1:1l8ky+Ew27CMX29uG+a2hNOKpeNYEQjjtiALiBlFQbY=
+github.com/yofu/dxf v0.0.0-20190710012328-5a6d1e83f16c h1:qgsxLgTXCVH8Dxar36HI5af2ZfinVz5vF8erPpyzM+A=
+github.com/yofu/dxf v0.0.0-20190710012328-5a6d1e83f16c/go.mod h1:gnT4GQzgKW8+TLI0xheUgdmNV4dsAN0WJUVnztRZkfI=
+golang.org/x/image v0.0.0-20180708004352-c73c2afc3b81/go.mod h1:ux5Hcp/YLpHSI86hEcLt0YII63i6oz57MZXIpbrjZUs=
+golang.org/x/image v0.0.0-20201208152932-35266b937fa6 h1:nfeHNc1nAqecKCy2FCy4HY+soOOe5sDLJ/gZLbx6GYI=
+golang.org/x/image v0.0.0-20201208152932-35266b937fa6/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
diff --git a/knoopvoet/knoopvoet b/knoopvoet/knoopvoet
new file mode 100755
index 0000000..a870390
Binary files /dev/null and b/knoopvoet/knoopvoet differ
diff --git a/knoopvoet/knoopvoet-18mm.scad b/knoopvoet/knoopvoet-18mm.scad
new file mode 100644
index 0000000..622db4b
--- /dev/null
+++ b/knoopvoet/knoopvoet-18mm.scad
@@ -0,0 +1,16 @@
+include <knoopvoet.scad>;
+
+button_d = 18.2;
+button_h = 4;
+button_offset = 1;
+
+
+outside = 2;
+foot_height = button_h+button_offset-0.5;
+foot_width = 15;
+hole_spacing = 5;
+hole_diameter = 3;
+hole_clearance = hole_spacing + hole_diameter;
+rim_h = 1;
+
+button_feet();
diff --git a/knoopvoet/knoopvoet-22mm5.scad b/knoopvoet/knoopvoet-22mm5.scad
new file mode 100644
index 0000000..3587224
--- /dev/null
+++ b/knoopvoet/knoopvoet-22mm5.scad
@@ -0,0 +1,14 @@
+include <knoopvoet.scad>;
+
+button_d = 24.5;
+button_h = 4;
+button_offset = 1;
+
+
+foot_height = button_h+button_offset-0.5;
+hole_spacing = 5.5;
+hole_diameter = 3;
+hole_clearance = hole_spacing + hole_diameter;
+rim_h = 1;
+
+button_feet();
diff --git a/knoopvoet/knoopvoet-multi.scad b/knoopvoet/knoopvoet-multi.scad
new file mode 100644
index 0000000..e66939a
--- /dev/null
+++ b/knoopvoet/knoopvoet-multi.scad
@@ -0,0 +1,50 @@
+include<knoopvoet.scad>
+include<knoopvoet_box.scad>
+
+number_of_feet = 8;
+small_size = 12;
+step_size = 2;
+size_list = [for (a = [0:(number_of_feet-1)]) small_size+step_size*a];
+small_height = 2;
+step_height = 0.25;
+height_list =[for (a = [0:(number_of_feet-1)]) small_height+step_height*a]; 
+small_hole = 6;
+step_hole = 0.2;
+hole_list =[for (a = [0:(number_of_feet-1)]) small_hole+step_hole*a]; 
+
+module feet(){
+for (i = [0:7]){
+  translate([36*i,0,0])//,small_size+step_size*i/2+10])
+ //rotate([-90,0,-90])
+    button_foot(height=height_list[i], diameter=size_list[i], hole_width = hole_list[i]);
+}
+}
+
+module storage_box() {
+  box=[60,30,46];
+  difference(){
+  translate([0,0,8])
+    bottom_box(box);
+    translate([-7*number_of_feet/2,-15*1.1/2,-15])
+      for (i = [0:7]){
+      translate([7*i,0,0])
+        cube([(height_list[i]+0.5)*1.1,15*1.1,16]);
+        if (i % 2 == 0) {
+        translate([7*i+2,-2,15])
+        linear_extrude(height=0.4,center = true) text(text=str(floor(size_list[i])),size=6,halign="center",valign="top");
+        }
+      }
+  }
+  //translate([0,0,60])
+ // translate([0,0,8])
+//top_box(box);
+}
+
+//rotate([90,0,0])
+storage_box();
+//rotate([90,0,0])
+//translate([-7*number_of_feet/2,0,-15])
+feet();
+
+
+
diff --git a/knoopvoet/knoopvoet.go b/knoopvoet/knoopvoet.go
new file mode 100644
index 0000000..8fddb4e
--- /dev/null
+++ b/knoopvoet/knoopvoet.go
@@ -0,0 +1,128 @@
+package main
+
+import (
+	"git.wtrh.nl/3D-models/objects"
+	"github.com/deadsy/sdfx/render"
+	"github.com/deadsy/sdfx/sdf"
+	"math"
+)
+
+type Button struct {
+	Size float64 // diameter of button
+	Thickness float64 // height of button
+	HoleSpacing float64 // Broadest cross length of thread holes.
+	Curve float64 // Depth of the curve
+}
+
+type DoveTail struct {
+	Size sdf.V3
+	Angle float64
+}
+
+var flange_h = 1.0
+var flange_w = 2.0
+var cloth_offset = 1.0
+
+var doveTail = DoveTail{
+	Size: sdf.V3{X: 10, Y: 8, Z: 2},
+	Angle: sdf.Pi/10,
+}
+
+func ButtonHolder3D(b *Button) (holder sdf.SDF3, err error) {
+	cylinderTickness := flange_h+cloth_offset+b.Curve
+	holder, err = sdf.Cylinder3D(cylinderTickness,b.Size/2+flange_w,0.0)
+	if err != nil {
+		return
+	}
+	negative, err := buttonNegative(b)
+	if err != nil {
+		return
+	}
+	holder = sdf.Transform3D(holder, sdf.Translate3d(sdf.V3{0,0,cylinderTickness/2}))
+	negative = sdf.Transform3D(negative, sdf.Translate3d(sdf.V3{0,0,cloth_offset}))
+	negative2, err := wireNegative(b)
+	if err != nil {
+		return
+	}
+	negative = sdf.Union3D(negative2,negative)
+	holder = sdf.Difference3D(holder,negative)
+	return
+}
+
+func buttonNegative(b *Button) (negative sdf.SDF3, err error) {
+	h := (math.Pow(b.Size/2,2)/b.Curve - b.Curve)/2
+	s1, err := sdf.Sphere3D(h)
+	if err != nil {
+		return
+	}
+	s1 = sdf.Transform3D(s1, sdf.Translate3d(sdf.V3{0,0,h}))
+	c1, err := sdf.Cylinder3D(h,b.Size/2,0.0)
+	if err != nil {
+		return
+	}
+	c1 = sdf.Transform3D(c1, sdf.Translate3d(sdf.V3{0,0,h/2}))
+	negative = sdf.Intersect3D(s1,c1)
+	return
+}
+
+func wireNegative(b *Button) (negative sdf.SDF3, err error) {
+	size := sdf.V3{X: b.HoleSpacing/2, Y: b.HoleSpacing/2, Z: 20}.MulScalar(math.Sqrt(2))
+	b1, err := sdf.Box3D(size,1.5)
+	if err != nil {
+		return
+	}
+	b1 = sdf.Transform3D(b1,sdf.RotateZ(sdf.Pi/4))
+	b1 = sdf.Elongate3D(b1,sdf.V3{X:b.Size,Y: 0, Z: 0})
+	negative =  sdf.Transform3D(b1,sdf.Translate3d(sdf.V3{-b.Size/2,0,0}))
+	return
+}
+
+func dovetail(size sdf.V3, angle float64, offset float64) (tail sdf.SDF3, err error) {
+	tail, err = sdf.Box3D(size, 0.0)
+	a1 := sdf.V3{X: 0, Y: size.Y/2+offset, Z:-size.Z/2}
+	a2 := sdf.V3{X: 0, Y: -size.Y/2+offset, Z:-size.Z/2}
+	n1 := sdf.V3{Y: -math.Cos(angle), X: 0, Z: -math.Sin(angle)}
+	n2 := sdf.V3{Y: math.Cos(angle), X: 0, Z: -math.Sin(angle)}
+	tail = sdf.Cut3D(tail, a1, n1)
+	tail = sdf.Cut3D(tail, a2, n2)
+	//bottomSize := sdf.V2{X: doveTail.Size.X, Y: doveTail.Size.Y}
+	//b2d := sdf.Box2D(bottomSize,0)
+	//topSize := bottomSize.Add(sdf.V2{X:0, Y: doveTail.Size.Z * math.Tan(doveTail.Angle) * 2})
+	//t2d := sdf.Box2D(topSize,0)
+	//tail, err = sdf.Loft3D(b2d, t2d, doveTail.Size.Z,0)
+	return
+}
+
+func main() {
+	k := objects.BoxParams{
+		Size: sdf.V3{100,100,100},
+		Wall: 3,
+		BottomTopRatio: 1,
+		Margin: 0.1,
+		Taper: 0.1,
+		ClosingHeight: 4,
+		CornerRadius: 3,
+	}
+	box, err := objects.BottomBox3D(&k)
+	if err != nil {
+		return
+	}
+	render.RenderSTL(box, 300, "out.stl")
+	b := Button{
+		Size: 18,
+		Curve: 1.2,
+		HoleSpacing: 8.5,
+	}
+
+	holder, err := ButtonHolder3D(&b)
+	if err != nil {
+		return
+	}
+	render.RenderSTL(holder, 300, "holder.stl")
+	negative, err := wireNegative(&b)
+	if err != nil {
+		return
+	}
+	render.RenderSTL(negative, 300, "negative.stl")
+	return
+}
\ No newline at end of file
diff --git a/knoopvoet/knoopvoet.scad b/knoopvoet/knoopvoet.scad
new file mode 100644
index 0000000..e76385e
--- /dev/null
+++ b/knoopvoet/knoopvoet.scad
@@ -0,0 +1,47 @@
+$fn = $preview ? 16 : 72;
+
+module button_foot(height = 4, diameter = 18, hole_width = 5) {
+button_offset = 1;
+foot_length = diameter/2+16;
+outside = 2;
+foot_height = height+button_offset;
+foot_width = 15;
+hole_diameter = 3;
+hole_clearance = hole_width;
+hole_spacing = hole_clearance - hole_diameter;
+rim_h = 1;
+//bottom
+  difference(){
+    union(){
+      cylinder(d=diameter+2*outside,h=foot_height);
+      translate([-foot_width/2,0,0])
+        cube([foot_width,foot_length,foot_height]);
+    }
+    //slot
+    translate([-hole_clearance/2,-diameter,-1])
+        cube([hole_clearance,diameter,foot_height+2]);
+    //button insert
+    translate([0,0,button_offset])
+        cylinder(d=diameter,h=foot_height);
+    //rim
+    translate([-diameter/2-outside-2,-diameter,button_offset+rim_h])
+        cube([diameter+2*outside+4,diameter,foot_height+2]);
+    //wire slots
+    hull(){
+    translate([hole_spacing/2,0,-1])
+        cylinder(d=hole_diameter*1.1,button_offset+2);
+    translate([-hole_spacing/2,0,-1])
+        cylinder(d=hole_diameter*1.1,button_offset+2);
+    translate([0,hole_spacing/2,-1])
+        cylinder(d=hole_diameter*1.1,button_offset+2);
+        }
+
+    // size indication
+    translate([0,foot_length-1,foot_height]){
+    linear_extrude(height=0.4,center = true) text(text=str(floor(diameter)),size=8,halign="center",valign="top");
+    translate([0,-10,0])
+    linear_extrude(height=0.4,center = true) text(text=str("mm"),size=5,halign="center",valign="top");
+    }
+
+  }
+}
diff --git a/knoopvoet/knoopvoet_box.scad b/knoopvoet/knoopvoet_box.scad
new file mode 100644
index 0000000..884c6fb
--- /dev/null
+++ b/knoopvoet/knoopvoet_box.scad
@@ -0,0 +1,99 @@
+$fn = $preview ? 16 : 72;
+
+wall_thickness = 3;
+//box = [21,21,21];
+box = [195,75,36];
+corner_radius = 2;
+cutoff = 0.5;
+overlap = 4;
+taper = 0.1;
+
+module outer_box(box) {
+  minkowski(){
+    cube([box.x+wall_thickness,box.y+wall_thickness,box.z+wall_thickness], center=true);
+    sphere(d=wall_thickness);
+  }
+}
+
+module box(size, wall=3, taper=0) {
+translate([0,0,-size.z/2])
+hull(){
+linear_extrude(height=0.1, scale=0)
+    offset(r=wall/2) square(size=[(size.x+wall-taper),(size.y+wall-taper)],center=true);
+    translate([0,0,size.z])
+    rotate([0,180,0])
+linear_extrude(height=0.1, scale=0)
+    offset(r=wall/2) square(size=[size.x+wall+taper,size.y+wall+taper],center=true);
+    }
+}
+
+module bottom_box(box) {
+  difference(){
+     //box(size=[box.x,box.y,box.z+2*wall_thickness] ,wall=wall_thickness);
+     outer_box(box);
+    translate([0,0,box.z*cutoff+wall_thickness])
+      cube([box.x+60,box.y+60,box.z],center=true);
+      //cube(box,center=true);
+    translate([0,0,box.z*cutoff+overlap-wall_thickness+0.01])
+      #box([box.x,box.y,overlap],wall=wall_thickness/2,taper=0.5);
+    translate([box.x/2+wall_thickness,0,0])
+    rotate([90,0,90])
+    side_text();
+    translate([-box.x/2-wall_thickness,0,0])
+    rotate([90,0,-90])
+    side_text();
+  }
+}
+
+module custom_text() {
+  linear_extrude(height=0.4,center=true)
+    text("Wetstone", valign="center", halign="center");
+}
+
+module side_text(){
+  linear_extrude(height=0.4,center=true)
+  scale(1.2)
+    text("Wetstone", valign="center", halign="center");
+    }
+
+module top_box(box) {
+  inner_wall_t = wall_thickness - 0.5;
+  difference(){
+    union(){
+      difference(){
+      outer_box(box);
+       //box(size=[box.x,box.y,box.z+2*wall_thickness] ,wall=wall_thickness);
+        translate([0,0,-box.z*(1-cutoff)+wall_thickness])
+          cube([box.x+60,box.y+60,box.z],center=true);
+      }
+      translate([0,0,overlap-wall_thickness+0.1])
+      box([box.x,box.y,overlap],wall=wall_thickness/2,taper=0.5);
+    }
+    translate([0,0,box.z/2+wall_thickness])
+    linear_extrude(height=0.4,center=true)
+    scale(3)
+        text("Wetstone", valign="center", halign="center");
+    cube(box,center=true);
+    translate([box.x/2+wall_thickness,0,0])
+    rotate([90,0,90])
+    side_text();
+    translate([-box.x/2-wall_thickness,0,0])
+    rotate([90,0,-90])
+    side_text();
+
+  }
+}
+
+module top_box_flip() {
+  rotate([0,180,0])
+    top_box();
+}
+
+*  rotate([0,90,0]){
+    bottom_box();
+    translate([0,0,20])
+    top_box();
+  }
+
+
+
diff --git a/knoopvoet/knoopvoet_test.go b/knoopvoet/knoopvoet_test.go
new file mode 100644
index 0000000..7783a98
--- /dev/null
+++ b/knoopvoet/knoopvoet_test.go
@@ -0,0 +1,50 @@
+package main
+
+import (
+	"github.com/deadsy/sdfx/render"
+	"github.com/deadsy/sdfx/sdf"
+	"testing"
+)
+
+//var doveTail = DoveTail{
+//	Size: sdf.V3{X: 10, Y: 8, Z: 2},
+//	Angle: sdf.Pi/10,
+//}
+var buttonStruct = Button{
+Size: 18,
+Curve: 1.2,
+HoleSpacing: 8.5,
+Thickness: 1.0,
+}
+
+func TestButtonHolder3D(t *testing.T) {
+	stl, err := ButtonHolder3D(&buttonStruct)
+	if err != nil {
+		t.FailNow()
+	}
+	render.RenderSTL(stl,300, "buttonHolder.stl")
+}
+
+func TestButtonNegative(t *testing.T) {
+	stl, err := buttonNegative(&buttonStruct)
+	if err != nil {
+		t.FailNow()
+	}
+	render.RenderSTL(stl,300, "buttonNegative.stl")
+}
+
+func TestWireNegative(t *testing.T) {
+	stl, err := wireNegative(&buttonStruct)
+	if err != nil {
+		t.FailNow()
+	}
+	render.RenderSTL(stl,300, "wireNegative.stl")
+}
+
+func TestDoveTail(t *testing.T) {
+	stl, err := dovetail(sdf.V3{X: 10, Y: 8, Z: 2}, sdf.Pi/8, 0)
+	if err != nil {
+		t.FailNow()
+	}
+	render.RenderSTL(stl,300, "doveTail.stl")
+}
\ No newline at end of file
diff --git a/knoopvoet/test.scad b/knoopvoet/test.scad
new file mode 100644
index 0000000..b543c71
--- /dev/null
+++ b/knoopvoet/test.scad
@@ -0,0 +1,12 @@
+radius = 5;
+depth = 2;
+
+diff_h = (pow(radius,2)/depth - depth)/2;
+diff_radius = (pow(radius,2)/depth - depth)/2 + depth;
+
+difference(){
+translate([0,0,0])
+cylinder(r=radius,h=depth);
+translate([0,0,diff_radius])
+sphere(r=diff_radius);
+}