Center of gravity scale for RC models

Building a center of gravity scale with the 3D printer for RC models.

For a long time I have fiddled around to build a suitable balance scale. I have invented nothing new but this suitable for 3D printing in conjunction with 20x20mm aluminum profiles implemented. The scale is stable and also suitable for larger models. Everyone can adjust the lengths of the aluminum profiles for his model size. Due to the two ball bearings the scale is very smooth running. The tilting of the model is limited by stops with +- 10 degrees each. The model cannot fall from the center of gravity scale. The rulers are provided with a scale every 5mm. For the millimeter accurate setting of the center of gravity, it is better to use a caliper.

3D printed parts
2x holder 20x20mm
2x rocker
1x linial holder left (must be mirrored in the cutter)
1x linial holder right
1x linial left
1x linial right
4x 20x20mm cover caps
8x angle

Aluminum profile 20x20mm, groove 6
The lengths of the aluminum profiles can be adjusted as desired.

Calculation of the length of the cross brace:
Always calculate at least 120mm plus your desired maximum hull width.

Aluminum profiles as an example for small airplanes
2x 150mm - vertical
1x 250mm - cross strut
2x 100mm - support, front/rear

Aluminum profiles as an example for larger airplanes
2x 300mm - vertical
1x 350mm - cross strut
2x 150mm - support, front/rear

Components
20x sliding blocks M5
18x screw M5x8
2x screw M5x10
2x washer 15mm
2x nut M8
2x (Allen) screw M8x30
2x ball bearing 22x7x8mm

Optional
2x knurled screw DIN 464 galvanized M5 x 12 for linial

I printed with PLA, 0,3 layer
To print the scale on the ruler in color, stop printing and change the color of the filament.

>The scaling of the rulers on the images with the black numbers is wrong and has been corrected, the picture with the numbers in white is correct, the template is corrected