December 17, 2025
Description
Radgauge is an innovative device designed to quickly and accurately measure the radius of a curved surface. Currently, various designs are available depending on the measurement range and function, and the characteristics of each design can be checked in the table below.
(Click on the letters in the table to go to the page where you can print the design.)
| Name | Measure Range (Radius) | Scale Unit | Measure Location | Size (mm) | Scale Type |
| 1~50mm | metric | Outter Round | 81.3 x 70.7 x 6.4 | ||
| 1~80mm | metric & imperial | Outter Round | 136.4 x 113.1 x 7.0 | ||
| 1~30mm | metric | 62.5 x 50.7 x 5.8 | |||
If you love old games, or something cute for keyring, R-MAN is ready for you.
Of all the RadGauge models, only the nano model had the ability to measure the radius from the inside of a corner. Several of you have requested a device capable of measuring larger inside radii, and this model is my answer.
I felt like simply adding functionality to the basic RadGauge model was a bit boring. Then, I remembered the linear 1:1 function featured in @vvj21's radius gauge, which I recently tested.
The original RadGauge series has a circular scale, and the spacing between the scale marks is wider than the actual distance to improve readability. While this made measurements easier, it made it difficult to tell the actual size of the measured radius. In contrast, @vvj21's device has the advantage of allowing you to visually verify the actual distance of the measured radius.
However, for linear, 1:1 measurements, the pointer must be able to move the required distance linearly. This forces the moving parts to have at least twice space of the actual travel distance they need. This inevitably increases the size of the device.
I felt that a larger device would be detrimental to usability and contradicted the RadGauge's design philosophy, so I devised a new approach.
By moving not only the pointer but also the scale in the opposite direction, I was able to halve the movement distance, limiting the component length to 1.5 times the measured length instead of twice, thus preventing unnecessary body size increases.
Furthermore, by arranging the scale and pointer movement perpendicular to the sliding direction of the measuring pin, rather than parallel, I was able to maintain the intuitive measurement method inherent in the original RadGauge.
After creating the device using a few ideas above, I was satisfied beyond expectation. Not only were the measurements accurate and easy to take, but the two components moving at right angles to the sliding measurement pin pleasantly stimulated my engineering sensibility.
The hole in the body is designed so that you can easily hang the device somewhere for storage, or you can hang it on your finger.
This model limits the inner radius of a round corner to a minimum measurement radius of 5 mm. Measuring smaller radii would require a sharper measuring pin, which can be inconvenient when measuring externally curved surfaces. This limitation was introduced to address this issue. If you need smaller inner radius measurements, please use the nano model.
Please note that if the build plate has poor adhesion, the scale may not print properly.
For smooth sliding, the use of a smooth plate is recommended.
Assembled at 50mm measurement settings.
This model is copyrighted and its commercial use is strictly prohibited.
This falls under the Non-Commercial (NC) condition of the Creative Commons license.
PROHIBITION OF PRINTING SERVICES: Providing this model file to any third party for the purpose of paid reproduction (printing) is strictly prohibited.
PERSONAL USE ONLY: All reproduction must be conducted solely on the end-user's personally owned 3D printer.
This license condition forbids the use of printing services, even for a single personal copy.
The unauthorized sale of this product by any other individual or entity is strictly prohibited and constitutes a violation of my brand rights. I require that any instances of unauthorized distribution or sales be reported to me immediately.
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Added inch scale profile. This profile only contains scale models, so you can use them instead of mm scales.
The scale is marked up to 2 inches, but the body only measures up to 50mm, so it can only measure up to 1.96 inches.
The body thickness has been reduced from 7.6mm to 5.8mm, saving printing time and materials.
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License:
Standard Digital File License
FunOrNothing
