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Replacement parts
Combination-square head replacement 300 mm
A replacement head for a 300 mm combination square with a 1 mm rule slot, a 45 degree face, and an M5 lock. Print in PETG; check it against a known square before trusting it for layout. 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, where the first 3 small changes are free.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 |
|---|---|
| rule thickness | 1 mm |
| rule width (height in slot) | 25.4 mm |
| clearance for sliding fit | 0.3 mm |
| length along rule travel | 45 mm |
| overall height | 30 mm |
| overall thickness (depth) | 22 mm |
| min wall thickness (PETG) | 2.4 mm |
| through hole clearance for M5 | 5.3 mm |
| socket head clearance | 9 mm |
| M5 hex nut across flats | 8 mm |
| nut thickness | 4 mm |
Example prompt
Create a combination-square head for a 1 mm × 300 mm rule, 45 degree face, M5 lock, 2.4 mm PETG walls. Verify against a reference square before use.
Fit notes
A die-cast head cracks at the slot. In SpeakCAD you measure the rule, preview the head in the browser, then download the STL.
Questions people ask about a combination-square head replacement 300 mm
A replacement head for a 300 mm combination square with a 1 mm rule slot, a 45 degree face, and an M5 lock. Print in PETG; check it against a known square before trusting it for layout.
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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