diff --git a/SyncGrips.py b/SyncGrips.py
new file mode 100644
index 0000000..8a0955d
--- /dev/null
+++ b/SyncGrips.py
@@ -0,0 +1,89 @@
+#%%
+from build123d import *
+from ocp_vscode import *
+
+
+import copy
+set_defaults(reset_camera=Camera.KEEP, render_joints=True, helper_scale=8)
+#%%
+sensor_width = 35
+r_sens = 6
+wall_thickness = 3
+t = 2.5 # sheet thickness
+w1 = sensor_width + 2* wall_thickness #sensor casing
+w2 = 150 #sensors center placed at corners of w2*w2 square
+h = 85 # total height
+h1 = 20 # sensor casing height
+h2 = 12
+h3 = 35# sensor casing + mpu height
+r = 25 # grip radius
+w3 = 20 # upper mount dx 
+r1 = 8 # bending radius
+locs = ((0,h+10), (-10,h-10),(10,h-10)) #locations of screws
+handle_len = w2+w1
+l = w2/2+sensor_width+r1+5 # half of the length
+
+#%%
+with BuildPart() as part_builder:
+    with BuildSketch() as profile_sketch:
+        with BuildLine() as line_builder:
+            line = Polyline((-w3, h+r/2),(-w3, h-r),(-l, 0),\
+                    (l,0),(w3,h-r), (w3,h+r/2),  close=False)
+            line1 = fillet(radius=r1,objects=line.vertices())
+            w = offset(amount=t)         
+        make_face()
+    extrude(amount=w1)
+    
+with BuildPart() as holes:
+    with BuildSketch(part_builder.faces().filter_by(Plane.YZ)[0]) as hole_sk:
+        dh = 10
+        dl = 5
+        with Locations((-dl,-dh),(dl,dh),(-dl,dh),(dl,-dh)):
+            Circle(2.05)
+            #SlotCenterToCenter(4,4, rotation=90)
+    extrude(amount=-50, both=True)
+    
+with BuildPart() as handle:
+    with BuildSketch(Plane.XY) as profile_sk:
+        with Locations((0,h)):
+            Circle(r)
+    extrude(amount=handle_len)
+    ch = r-w3+4
+    with Locations((w3+ch/2-t,h,w1/2), (-w3-ch/2+t,h,w1/2), (w3+ch/2-t,h,w2+w1/2), (-w3-ch/2+t,h,w2+w1/2)):
+        Box(ch, r*2, w1, mode=Mode.SUBTRACT)
+    add(holes, mode=Mode.SUBTRACT)
+
+with BuildPart() as sensor_cutout:
+    with BuildSketch(Plane.XZ) as sensor_sk1:
+        d = 0
+        Rectangle(22,26)
+        
+    sensor_space = extrude(amount=-14)
+    faces = (sensor_space.edges().group_by(Axis.Y)[-1] | Axis.Z)
+    #chamfer(objects=faces, length=6)
+    
+with BuildPart() as sensorhole:
+    with BuildSketch(Plane.XZ) as sensorhole_sk:  
+        with Locations((-sensor_width/2,0)):
+            Circle(1.55)
+    extrude(amount=-14)
+    
+with BuildPart() as sensors:
+    dz = -5
+    ds = 4
+    with Locations((w2/2+ds,dz,w1/2),  (w2/2+ds,dz,w2+w1/2)):
+        #Box(w1, 5, w1, mode=Mode.ADD)
+        add(sensor_cutout)
+    with Locations(((-w2/2-ds,dz,w1/2),(-w2/2-ds,dz,w2+w1/2))):
+        add(sensor_cutout.part.mirror(Plane.YZ))
+    
+upper_sheet = part_builder.part - holes.part - sensors.part
+lower_sheet = Location((0,0,handle_len-w1))*upper_sheet
+show(upper_sheet, lower_sheet,handle.part,reset_camera=False)
+
+#%%
+
+
+#%%
+
+syncgrips = Compound(children=[sensor_cutout.part, sensor_cutout.part.mirror(Plane.YZ)])
\ No newline at end of file
diff --git a/dempf.py b/dempf.py
new file mode 100644
index 0000000..def26f7
--- /dev/null
+++ b/dempf.py
@@ -0,0 +1,39 @@
+#%%
+from build123d import *
+from ocp_vscode import *
+
+
+import copy
+set_defaults(reset_camera=Camera.KEEP, render_joints=True, helper_scale=8)
+#%%
+
+with BuildPart() as p:
+    with BuildSketch() as pipe:
+        Circle(20)
+        Circle(19, mode=Mode.SUBTRACT)
+    extrude(amount=20)
+    with BuildSketch() as s:
+        with PolarLocations(20,8):
+            Rectangle(5,2)
+    extrude(amount=2, mode=Mode.SUBTRACT)
+    
+show(p)
+
+#%%
+rf = 8
+l = 70
+with BuildPart() as handle:
+    with BuildSketch(Plane.XZ) as handle_sk:
+         RectangleRounded(l,90.10)
+    with BuildLine() as outline:
+            
+        make_face()
+    with BuildSketch(Plane(j2 @ 0, z_dir=j2 % 0)) as x_section:
+            Circle(8)
+    sweep()
+        #illet(handle_sk.vertices().group_by(Axis.X)[0],radius=1)
+            
+show(handle_sk)
+# %%
+show(handle_sk.vertices().group_by(Axis.X)[0])
+# %%
diff --git a/roller_coaster.py b/roller_coaster.py
new file mode 100644
index 0000000..1959fd5
--- /dev/null
+++ b/roller_coaster.py
@@ -0,0 +1,54 @@
+
+#%%
+from build123d import *
+from ocp_vscode import show
+import numpy as np
+#%%
+with BuildLine() as roller_coaster:
+    powerup = Spline(
+        (0, 0, 0),
+        (50, 0, 50),
+        (100, 0, 0),
+        tangents=((1, 0, 0), (1, 0, 0)),
+        tangent_scalars=(0.5, 2),
+    )
+    corner = RadiusArc(powerup @ 1, (100, 60, 0), -30)
+    screw = Helix(75, 150, 15, center=(75, 40, 15), direction=(-1, 0, 0), mode=Mode.PRIVATE)
+    Spline(corner @ 1, screw @ 0, tangents=(corner % 1, screw % 0))
+    add(screw)
+    Spline(screw @ 1, (-100, 30, 10), powerup @ 0, tangents=(screw % 1, powerup % 0))
+show(roller_coaster)
+
+# %%
+with BuildPart() as coaster:
+    thepath = powerup
+    n = int(thepath.length/4)
+    r0 = 90
+    r1 = 45
+    d = 2
+    d1 = 0.4
+    locs_l = ((-d/2.,0))
+    locs_r = ((d/2.,0))
+    p1 = Plane(thepath @ 0, z_dir=thepath % 0).rotated((r0,0,0))
+    p2 = Plane(thepath @ 1, z_dir=thepath % 1).rotated((r1,0,0))
+    with BuildSketch(p1) as sk:
+        with Locations(locs_l):
+            sl = Circle(d1)
+    with BuildSketch(p1) as sk1:
+        with Locations(locs_r):
+            sr = Circle(d1)
+    with BuildSketch(p2) as sk2:
+        with Locations(locs_l):
+            el = Circle(d1)
+    with BuildSketch(p2) as sk3:
+        with Locations(locs_r):
+            er = Circle(d1)   
+    sweep(sections=[sk.sketch,sk2.sketch], multisection=True, path=thepath)
+    sweep(sections=[sk1.sketch,sk3.sketch], multisection=True, path=thepath)
+    for r, t in zip(np.linspace(r0,r1,n),np.linspace(0,1,n)): 
+        with Locations((thepath.location_at(t))):
+            Box(d,0.2,0.3,rotation=(0,0,r))
+   
+show(coaster)
+
+# %%