Brackets and mounts
Test Tube Sensor Box (Exploded Multi-Part)
- Bounding box
- 1261.5 × 42.0 × 158.0 mm
- Engine
- Precision B-rep
- Parameters
- 37
- Published
- October 29, 2026
Download
Free to download and use. See the terms.
The prompt
Design a 3D-printable, multi-part test tube sensor box (CAD model, export STEP/STL). All units in cm. Add 0.1 cm clearance on all fitting parts. Axes: X = length, Y = width, Z = height. OUTER BOX: 10 (X) x 3.5 (Y) x 7 (Z), wall thickness 0.2. SEPARATE PARTS: 1. Base tray (floor + 4 walls, open top) 2. Top lid 3. TCS sensor holder (slider) 4. LED holder (slider) 5. Two pointer knobs with M3 screws 6. Connectors between tray and lid: snap-fit clips or screw tabs with alignment pins, so I can assemble it myself. TEST TUBE (diameter 2.3, length 15): - Round hole in the exact centre of the lid (X=5, Y=1.75), diameter 2.4. - Directly below it inside the tray, a tube support cup: recess diameter 2.4, 0.4 deep, top at Z=1.0 from the inner floor. The tube stands vertical and sticks out of the top. SLIDING HOLDERS: - TCS sensor on one side of the tube, LED on the opposite side, both facing the tube, optical axis at Z=3.0 from the inner floor. - At position 0 cm, the holder front face touches the tube. Each holder slides away from the tube in a straight line along X, 0 to 3 cm, on guide grooves in the floor and inner walls (smooth, no wobble). - TCS holder: pocket for a 3 x 3 board, open window in front for the sensor, thickness 0.6, wire slot at the back. - LED holder: hole diameter 0.52 for the LED front (0.5 dia), seat depth 0.9, aimed at the tube, wire slot at the back. - Each holder has a boss with an M3 hole (or nut trap) on the side facing the front wall, centred at Z=3.0. EXTERNAL SLIDE CONTROL: - On the front long wall (10 x 7 face), cut two horizontal slots at Z=3.0, width 0.35, one for the TCS holder and one for the LED holder, matching the 3 cm travel. An M3 screw plus knob goes through the slot into the holder boss and moves it. - Engrave scale markings 0, 1, 2, 3 cm with numbers beside each slot (0 nearest the tube). Each knob has an arrow pointer, so the position is readable from outside with the box closed. Show an exploded view of all parts.
Parameters
| Name | Value | Range |
|---|---|---|
| Outer Length X | 100 mm | 60 – 160 |
| Outer Width Y | 35 mm | 25 – 70 |
| Outer Height Z | 70 mm | 40 – 120 |
| Wall Thickness | 2 mm | 1.2 – 4 |
| Floor Thickness | 2 mm | 1.2 – 5 |
| Lid Thickness | 2 mm | 1.2 – 5 |
| Lid Tube Hole Dia | 24 mm | 20 – 35 |
| Support Cup Outer Dia | 28 mm | 20 – 40 |
| Cup Top Above Inner Floor | 10 mm | 3 – 20 |
| Cup Recess Dia | 24 mm | 20 – 34 |
| Cup Recess Depth | 4 mm | 1 – 8 |
| Test Tube Dia | 23 mm | 12 – 30 |
| Test Tube Length | 150 mm | 80 – 220 |
| Optical Axis Height | 30 mm | 15 – 55 |
| Front Slot Width | 3.5 mm | 2 – 8 |
| Slider Travel | 30 mm | 10 – 45 |
| Holder Body Thickness | 6 mm | 4 – 14 |
| Holder Width Y | 25 mm | 16 – 29 |
| Holder Height Z | 34 mm | 20 – 50 |
| TCS Board Pocket Size | 20 mm | 10 – 26 |
| TCS Open Window Size | 10 mm | 4 – 20 |
| LED Through Hole Dia | 5.2 mm | 3 – 12 |
| LED Seat Dia | 9 mm | 5 – 16 |
| LED Seat Depth | 5 mm | 1 – 9 |
| M3 Boss Dia | 8 mm | 5 – 12 |
| M3 Boss Hole Dia | 2.5 mm | 2 – 3.6 |
| Pointer Knob Dia | 20 mm | 12 – 30 |
| Pointer Knob Thickness | 5 mm | 3 – 10 |
| Screw Shank Dia | 3 mm | 2 – 5 |
| Screw Shank Length | 12 mm | 6 – 25 |
| Screw Head Dia | 5.5 mm | 4 – 9 |
| Screw Head Height | 2 mm | 1 – 4 |
| Connector Clip Length | 20 mm | 12 – 34 |
| Connector Clip Width | 10 mm | 6 – 20 |
| Connector Clip Height | 4 mm | 2 – 8 |
| Alignment Pin Dia | 3 mm | 1.5 – 6 |
| Exploded Layout Gap | 120 mm | 60 – 250 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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