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Hobby & gaming
RC car body post extension
Body post extensions raise an RC car shell to clear larger tyres or a taller chassis, and the stock posts are rarely long enough. A typical extension is a 6 mm diameter tube 30 mm long with a 3.2 mm through bore for the body clip pin, a 12 mm hex base that seats over the original post, and a 3 mm cross hole every 10 mm for clip height adjustment. Printing vertically in PETG or nylon keeps the pin holes round and the post tough enough for crashes. 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 |
|---|---|
| total post height (from base top to tip) | 30 mm |
| post outer diameter | 6 mm |
| through bore diameter (for body clip pin) | 3.2 mm |
| hex base width (across flats) | 12 mm |
| hex base height | 8 mm |
| socket diameter to slip over existing post | 6.2 mm |
| socket depth into hex base | 6 mm |
| cross hole diameter | 3 mm |
Example prompt
Design an RC body post extension 30 mm tall with a 6 mm outer diameter, a 3.2 mm through bore, a 12 mm hex base 8 mm tall with a 6.2 mm socket to slip over the existing post, and 3 mm cross holes every 10 mm.
Fit notes
SpeakCAD builds the extension around your car's actual post diameter and the lift you need, so there is no cutting or shimming a mismatched download. Change the length or hole spacing in a sentence, preview in the browser, and download once it fits.
Questions people ask about an RC car body post extension
Body post extensions raise an RC car shell to clear larger tyres or a taller chassis, and the stock posts are rarely long enough. A typical extension is a 6 mm diameter tube 30 mm long with a 3.2 mm through bore for the body clip pin, a 12 mm hex base that seats over the original post, and a 3 mm cross hole every 10 mm for clip height adjustment. Printing vertically in PETG or nylon keeps the pin holes round and the post tough enough for crashes.
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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