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Tools & jigs
Center finder marking gauge
A center finder lays two angled legs against the edges of a board so a pencil dropped through the middle hole scribes a line exactly down the center, whatever the width. The tool is a flat V shape about 120 mm across with legs at 45 degrees, a 3 mm pencil hole at the apex and a 20 mm central slot for stock up to 60 mm wide. Add 0.5 mm chamfers so it slides smoothly, and print it flat in PLA or PETG. Open the ready-made model free, resize it on your phone or computer, then download a print-ready STL, 3MF or G-code sliced for your printer, free.Opening the ready-made model and downloading it as STL or 3MF are free, no card; AI changes use credits, from Maker at $7.99 a month.No printer? We print this part and ship it to your door. See its priceUpdated
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Adjust
Change its numbers in the viewer for free, or ask the AI in the chat: wall thickness, hole size, the thing it clips onto. AI changes use 2 credits per request (1 for a quick edit, 3 for a redesign), paid with a plan from Maker at $7.99 a month.3Print
Download a watertight STL or 3MF free, with your numbers and hand edits, or G-code sliced for your printer at the same price. After an AI change the download is included in every plan (4 credits without one).
Dimensions of the ready-made model (editable)
| Parameter | Value |
|---|---|
| overall top width | 120 mm |
| overall height (apex at y=0, top at y=height) | 60 mm |
| plate thickness | 8 mm |
| edge chamfer size | 0.5 mm |
| distance of hole center from apex | 12 mm |
| slot bottom y | 25 mm |
Example prompt
Model a center finder marking gauge: flat V-shaped body 120 mm wide, 60 mm tall, 8 mm thick, legs at 45 degrees, a 3.2 mm pencil hole at the apex, a 4 x 20 mm center slot, and 0.5 mm chamfers on all edges.
Fit notes
Rather than settling on a gauge that only handles the widths someone else needed, tell SpeakCAD the widest stock you work with and the pencil you use. The geometry is regenerated to fit, and you can request a second slot for offset lines right in the conversation. Open the ready-made model free, change its numbers in the viewer and download the STL or 3MF free; AI changes use credits.
Questions people ask about a center finder marking gauge
A center finder lays two angled legs against the edges of a board so a pencil dropped through the middle hole scribes a line exactly down the center, whatever the width. The tool is a flat V shape about 120 mm across with legs at 45 degrees, a 3 mm pencil hole at the apex and a 20 mm central slot for stock up to 60 mm wide. Add 0.5 mm chamfers so it slides smoothly, and print it flat in PLA or PETG.
Click Open it free on this page and create a free account (no card): the ready-made model opens in your browser, on your phone or computer, nothing to install. Change its numbers in the viewer for free and download a watertight STL or 3MF free, or G-code sliced for your printer at the same price. An AI change in the chat uses 2 credits per request (3 for a redesign), and the download after it is included in every plan (4 credits without one). Start with Maker: 50 credits a month for $7.99, cancel anytime.
On this page: open the ready-made model free in a SpeakCAD account (no card), change any dimension in the viewer, then download the STL or 3MF free, or G-code sliced for your printer at the same price.
A shared STL is modelled for someone else's measurements. Here you open the ready-made model free, change it to your measurements in the viewer, then download a file sized for the part you actually own, free as STL or 3MF.
Yes. SpeakCAD slices the part on its servers with OrcaSlicer and your printer's official profile (380+ printers, including Bambu Lab, Prusa, Creality and Elegoo), and you download the G-code (a sliced .gcode.3mf for Bambu Lab printers). G-code sliced for your printer costs the same as the STL: included in every plan, free for a part you shaped by hand, 4 credits without a plan for a part with AI work in it. Pick your printer on the printers page to see its profile.
No. SpeakCAD runs in the browser on your phone or computer: the chat, the 3D engine and the live viewer load in the tab. The only file you download is the finished STL, 3MF or sliced G-code.
Print it your way
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