CAD Designer Required – 3D Printable Custom Precision Drilling Jig

I am looking for an experienced CAD / mechanical product designer to convert my attached technical concept drawing into a functional, dimensionally accurate and 3D-printable custom precision drilling jig. I have already designed the overall concept and produced a dimensioned Illustrator drawing showing the front, right-side, left-side and back views of the jig. The CAD designer's role is to translate this drawing accurately into a proper 3D CAD model, review the design for FDM printability and mechanical functionality, and make appropriate engineering recommendations where required. This is a functional precision tool, rather than a cosmetic 3D model. 1. Purpose The jig is designed to fit onto 25 × 25 mm square steel tubing and establish a repeatable drilling position. The steel tubing has an approximate wall thickness of 1.5 mm. The purpose of the jig is to eliminate the inaccuracies I have experienced when manually measuring, centre-punching and drilling the steel tubing. Once positioned on the steel tube, the jig will be secured firmly using external G/C-clamps. A removable metal drill-guide bush will screw into the jig and physically constrain/guide the drill bit during drilling. 2. Attached Drawing Is the Primary Dimensional Reference Please use the attached Illustrator/PDF technical drawing as the primary dimensional reference. The drawing contains: Front view Right-side view Left-side view Back view Overall component dimensions Two-piece construction Locating/connection features Drill-guide position Threaded receiver position Steel-tube locating geometry Left/right orientation Please do not estimate dimensions from the proportions of the drawing. Where a dimension is explicitly stated on the drawing, that numerical dimension takes precedence over the visual scale/proportion of the illustration. If any dimension is unclear, conflicting or insufficient to create the CAD model, please ask me before making an assumption. 3. Critical Drilling Geometry Two dimensions are particularly important to the function of the jig. Vertical drill position The centre axis of the drill guide must be: 285 mm from the specified top locating datum to the CENTRE of the drilling axis. The 285 mm measurement is to the centre of the hole, not its upper or lower edge. Horizontal drill position The jig is designed around 25 mm wide square steel tubing. The drilling axis must therefore be: 12.5 mm from the side of the 25 mm tube placing the drilling axis on the centreline of the tube. These dimensions are critical functional dimensions and must be maintained in the finished CAD model. 4. Threaded Metal Drill Guide The jig requires a female threaded receiver for an existing removable metal drill-guide bush. Required female thread: M14 × 2.0 The existing male metal component has approximately: 11 mm threaded engagement length. The M14 × 2.0 female thread must be properly modelled in the CAD geometry, rather than merely represented cosmetically. The surrounding printed structure should provide sufficient material and rigidity to support the metal guide while drilling. Where appropriate, please reinforce this area using suitable wall thickness, fillets, ribs or other features. The threaded receiver should preferably remain parametric/editable so minor tolerance adjustments can be made following the first physical test print if necessary. 5. Two-Piece Jig Construction Each completed jig consists of TWO separately 3D-printed components. These components are shown separately in the attached technical drawing and assemble together to produce the complete jig. The drawing currently specifies the relevant component dimensions, including the 220 mm and 180 mm sections and their corresponding locating/connection geometry. The connection between the two printed components is extremely important. Once assembled, the two parts must: Positively locate against one another Maintain the specified overall geometry Maintain the exact drilling position Resist lateral movement Resist twisting Resist angular movement Remain rigid under clamping pressure Remain rigid while the drill is applying axial and lateral forces The assembled jig must continue to establish the 285 mm drill-centre position accurately. I am open to the CAD designer improving the connection geometry if a better mechanical solution is recommended. However, please discuss any significant dimensional or functional changes with me before altering the concept. 6. Fit Around the 25 × 25 mm Steel Tube This is a locating jig, so the fit around the steel tubing is critical. The jig is intended for nominal: 25 × 25 mm square steel tube. I do not want excessive tolerance added around the steel tube simply because the component is being FDM printed. The objective is the minimum practical clearance necessary to: Fit onto normal 25 × 25 mm steel tubing Allow installation and removal Account for realistic FDM dimensional variation Avoid binding while still preventing perceptible lateral movement that could change the intended drill position. The jig itself establishes the position. The external G/C-clamps then secure that established position and prevent movement during drilling. Please recommend the appropriate CAD clearance/tolerance for this interface before finalising the model. 7. Clamping The completed jig will be secured to the steel structure using multiple external G/C-clamps. The additional length and geometry shown in the drawing are intentional and provide areas where the jig can be clamped securely to the existing structure. The CAD design therefore needs to provide adequate rigidity along these clamping regions. The printed components should not significantly bow, twist or distort when the clamps are tightened. Please consider clamp-loading when determining: Wall thickness Internal reinforcement Ribs Fillets Print orientation Infill recommendations Material recommendations 8. Existing Pilot Holes in Steel The prototype steel tubes already contain some small, slightly misplaced pilot holes from earlier manual drilling attempts. The new jig is intended to establish the correct drilling axis independently of those existing holes. There is therefore a possibility that the drill bit will encounter part of an existing off-centre pilot hole while enlarging the final hole. This could create lateral force on the drill bit. The jig and metal drill guide must therefore remain sufficiently rigid that the drill bit is constrained to the intended axis rather than allowing the existing pilot hole to pull the drill away from the correct position. This is one of the primary reasons for creating the jig. 9. Left-Hand and Right-Hand Versions IMPORTANT: The attached drawing shows the LEFT-HAND version. A second complete: RIGHT-HAND VERSION is also required. The right-hand version must be the exact appropriate mirror of the left-hand assembly. Think of the two finished jigs as a matched pair similar to a left and right shoe. The right-hand version should preferably be generated directly from the master left-hand CAD geometry rather than independently redrawn. All critical dimensions must remain identical between the two versions, including: 285 mm drill-centre height 12.5 mm tube centreline M14 × 2.0 threaded receiver and all corresponding locating geometry. 10. Required CAD Components The project therefore requires FOUR separately printable components: Left-Hand Jig Left Jig – Component A Left Jig – Component B Right-Hand Jig 3. Right Jig – Component A 4. Right Jig – Component B The completed left and right assemblies should also be supplied as assembled CAD models so that their alignment and geometry can be inspected. 11. FDM Design Requirements The parts will be manufactured using FDM 3D printing. The CAD designer should therefore consider: Dimensional accuracy Appropriate FDM clearances Print orientation Layer direction relative to drilling forces Strength around the M14 receiver Strength around the two-piece joint Clamp-loading Wall thickness Local reinforcement Fillets/ribs Prevention of flex Practical assembly Ease of test fitting Ability to revise tolerances after prototype testing Please do not simply reproduce the Illustrator geometry without considering whether any features require modification for reliable FDM printing. Any recommended engineering changes should be discussed with me before the final model is produced. 12. Required Deliverables Final delivery should include: 4 individual print-ready STL files Left Component A Left Component B Right Component A Right Component B STEP/STP files Original editable/native CAD source files Complete assembled Left-Hand Jig CAD model Complete assembled Right-Hand Jig CAD model Properly modelled M14 × 2.0 female thread Confirmation of the 285 mm drilling centre Confirmation of the 12.5 mm tube centreline Confirmation of the proposed 25 × 25 mm tube fit/clearance Recommended FDM print orientation Recommended printing parameters/material where appropriate The CAD model should remain parametric/editable wherever practical, particularly around critical fit and threaded features, because minor adjustments may be required after the first prototype is physically printed and tested. 13. Before Starting I will provide: Attached dimensioned technical drawing Photographs of the actual steel frame Photographs of the 25 × 25 mm steel tubing Existing metal M14 × 2.0 drill-guide component Measurements of the metal drill guide Additional physical measurements if required Before beginning the final CAD model, please confirm: You understand how the jig is intended to function. You understand that the drawing supplied represents the left-hand version. You understand that a complete mirrored right-hand version is also required. You understand that each jig consists of two separately printable components. You understand the importance of the 285 mm × 12.5 mm drilling-axis position. Your proposed clearance for fitting the jig onto 25 × 25 mm steel tubing. Whether you recommend any changes to the two-piece connection. Whether you recommend any structural reinforcement for FDM printing. Your fixed price for the complete project. Your expected turnaround time. Important Please do not change critical dimensions or make assumptions about missing dimensions without checking with me first. The primary objective is to create a rigid and repeatable precision drilling jig that can be clamped onto the existing steel structure and accurately guide the drill through the required position. Dimensional accuracy, rigidity and repeatability are more important than cosmetic appearance.