This guide walks you through every stage of creating a custom 3D-printable tool insert with TracetoForge, from taking the photo to printing the finished part. The whole process takes around two minutes per tool once you know the workflow. No CAD experience is needed.
Before you start, gather a smartphone with a working camera, a sheet of plain white paper (A4 or US Letter), the tool you want to make an insert for, and a 3D printer with PETG or PLA filament. If you do not own a 3D printer, you can still trace and preview the insert for free, then send the exported STL to a print service or buy ready-made inserts from our shop.
Place the tool flat on a sheet of white paper on a non-reflective surface. The white paper does two jobs: it gives the edge detector a clean contrast against your tool, and it acts as a known-size reference so the editor can convert pixels to millimeters.
Hold your phone directly above the tool, as level as possible. Get high enough that the tool fills about half the frame, with the entire tool plus all four corners of the paper visible. Use diffused lighting (overhead room light or soft natural light from a window). Avoid harsh direct shadows and avoid glare on shiny chrome tools — a piece of tracing paper or a thin t-shirt over a lamp diffuses light nicely.
Common photo problems and fixes: blurry photo (hold phone steadier or use a tripod); shadow falling across the tool (move the light source overhead); part of tool cut off (zoom out); shiny tool reflecting the camera (rotate the tool slightly or use diffuse light); paper edges cropped (zoom out and recompose).
Open the TracetoForge editor and drag your photo onto the upload area. The editor loads OpenCV.js and processes the image entirely in your browser. After a moment, you will see your photo with a red outline showing the detected tool boundary.
If the trace looks right, move on. If it missed parts of the outline, included background noise, or picked up shadows, adjust the Sensitivity slider. Lower values (1-2) use Otsu thresholding, ideal when you have strong contrast (dark tool on white paper). Mid-range (3-8) uses Canny edge detection, the safe default. Higher values (9-10) use adaptive thresholding for low-contrast or shadowed photos.
The Simplification slider controls how many anchor points the trace uses. Higher simplification means a smoother outline with fewer points, which prints faster and more reliably. Lower simplification preserves fine detail.
Click the dimension tool and either enter the actual length of your tool in millimeters, or click two corners of the paper to set scale automatically using the known paper size. This calibration is critical: without it, the editor has no way to know whether your tool is a 100mm pair of pliers or a 300mm pair of bolt cutters.
TracetoForge offers three output modes:
Custom Tray creates a rectangular or oval tray with adjustable wall thickness, depth, and dimensions. Use this for Milwaukee Packout, DeWalt ToughSystem, or any custom toolbox drawer. Enter your drawer's interior dimensions and the tool cavity is cut into the tray.
Gridfinity Bin generates a Gridfinity-compatible bin with the standard 42mm grid spacing and proper base profile. Drops directly into any Gridfinity baseplate. The cavity is cut from the tool outline.
3D Object exports just the extruded tool shape. Useful for shadow boards, foam templates, or custom mounts.
The Tolerance slider adds clearance around your tool so it slides in and out without sticking. Start at 0.5mm and adjust based on your printer's calibration. Tighter prints can use 0.3mm; looser prints might need 0.7mm.
Add a Finger Notch if you want a curved cutout for grabbing the tool. The notch can be positioned at either end of the tool cavity. For multiple tools in one tray, each tool can have its own independent notch.
Up to five tools fit in a single insert. Click "Add Tool" and trace a new photo. Each tool can be repositioned by dragging in the 3D preview. Each has independent settings for cavity depth, tolerance, rotation, and finger notch. This is the fastest way to build a complete drawer of pliers, screwdrivers, or wrenches in a single print.
The 3D preview shows your insert exactly as it will print. Rotate, zoom, and inspect the geometry from all angles. If anything looks off (wrong cavity depth, weird overhangs, missing notches), go back and adjust. The preview updates in real time as you change settings.
Pick your format and click Export. Exporting requires one credit per file:
STL for standard single-material 3D printing. Works with every slicer.
3MF for multi-material or multi-color prints (Bambu AMS, Prusa MMU).
SVG for laser cutting foam, plywood, or acrylic versions of the same shape.
DXF for CNC routing wood or aluminum trays.
Open the STL or 3MF in your slicer. Recommended settings for tool inserts:
Print one tray first and test fit your tool. If it sticks, increase tolerance by 0.2mm and reprint. If it rattles loose, decrease tolerance. Once dialed in, those tolerance values will work for all your future inserts on the same printer.
A single-tool insert typically prints in 1 to 3 hours depending on size and tray dimensions. A full Gridfinity-compatible drawer (5 tools) takes 6 to 10 hours.
Yes. Sign in, open the dashboard, and click any saved project to load it back into the editor with all your settings preserved.
No. The trace is independent of tray dimensions. Change the tray size and re-export.
Ready to start? Open the editor and upload your first photo. Need inspiration? Browse the TracetoForge blog for project ideas.