diff --git a/3d-design/mtvplot_arm_back.stl b/3d-design/mtvplot_arm_back.stl
new file mode 100644
index 0000000..8486f3d
Binary files /dev/null and b/3d-design/mtvplot_arm_back.stl differ
diff --git a/3d-design/mtvplot_arm_front.stl b/3d-design/mtvplot_arm_front.stl
new file mode 100644
index 0000000..14c7a67
Binary files /dev/null and b/3d-design/mtvplot_arm_front.stl differ
diff --git a/3d-design/mtvplot_gear.stl b/3d-design/mtvplot_gear.stl
new file mode 100644
index 0000000..a762afe
Binary files /dev/null and b/3d-design/mtvplot_gear.stl differ
diff --git a/3d-design/mtvplot_penlock.stl b/3d-design/mtvplot_penlock.stl
new file mode 100644
index 0000000..86eead2
Binary files /dev/null and b/3d-design/mtvplot_penlock.stl differ
diff --git a/3d-design/mtvplot_servo_mount.stl b/3d-design/mtvplot_servo_mount.stl
new file mode 100644
index 0000000..083c643
Binary files /dev/null and b/3d-design/mtvplot_servo_mount.stl differ
diff --git a/3d-design/mtvplot_spacer_1.0mm.stl b/3d-design/mtvplot_spacer_1.0mm.stl
new file mode 100644
index 0000000..301e76d
Binary files /dev/null and b/3d-design/mtvplot_spacer_1.0mm.stl differ
diff --git a/3d-design/mtvplot_spacer_1.5mm.stl b/3d-design/mtvplot_spacer_1.5mm.stl
new file mode 100644
index 0000000..9590325
Binary files /dev/null and b/3d-design/mtvplot_spacer_1.5mm.stl differ
diff --git a/3d-design/mtvplot_spacer_2.0mm.stl b/3d-design/mtvplot_spacer_2.0mm.stl
new file mode 100644
index 0000000..2050f4f
Binary files /dev/null and b/3d-design/mtvplot_spacer_2.0mm.stl differ
diff --git a/3d-design/mtvplot_stepper_holder.stl b/3d-design/mtvplot_stepper_holder.stl
new file mode 100644
index 0000000..9f9a45a
Binary files /dev/null and b/3d-design/mtvplot_stepper_holder.stl differ