native_res_factor for similar plotter

[songa]

hello,
I have the following similar A3 plotter…
https://ae01.alicdn.com/kf/S6eae6801d29f480bac5bf6a2c2faf754s.jpg

When I made a print for the first time, I noticed that the measurements on the print were different from the measurements in InkScape (smaller).
Researching, I discovered that through the variable native_res_factor using the value 1270.0, the proportion was apparently equal to that of Inkscape…
However, this only happened for the height of the drawing and the width was a little smaller than the original drawing.
The two motors (17PM-K041-P2FF) are identical and the pulleys are also identical (20t metal pulleys).
Another interesting detail is that if I draw a 300mm x 50mm rectangle and another 50mm x 300mm rectangle, the smaller measurements are always more wrong and the larger measurements are closer to reality.

Could someone help me with this change to be able to work on my plotter?

[songa]

The solution found was as follows: I changed the two original pulleys of this kit, for the same pulley used in AxiDraw kit.

[Author]

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