u/schupinpin

Hi,
I'm a begginer on plotting and I'm not sure my question belongs her as it's more hardware related than "code".

I bought a cheap XY plotter like this one : https://static.wixstatic.com/media/04340a_06f6c6380dbe41fd907c74f4a2c81422~mv2.jpg

I'm realy enjoying coding and plotting things and, since I'm just a hobbyist, I'm quite pleased with the results.

Deformed circles close to y max

Good shapes close to y=0

But I notice a little issue : when I'm at the maximum Y-axis extension, I have a lot of overhang, and the precision isn't as good. This is especially noticeable when I try to make concentric circles :

Does anyone have any ideas on how to fix this?