I wanted to print a universal battery connector to ease reusing old battery in home made electronic projects.
The holder needs to be circular for the magnet to stick into it.
Yet, mine were square-ish. I then tried several precision and nozzle speed, but still square-ish.
![](https://konubinix.eu/ipfs/bafybeihhodgvtbrexfrudkvv5yozliigc5xka24vzqn2oyuic66hawxxme?filename=a.png)
I tried printing several circles to see how bad it could print circles.
![](https://konubinix.eu/ipfs/bafybeifusml5wgry23azsj2njk6z4mfgxtrznjgsaef56w56sow7r4755u?filename=a.png)
Then, I read that the belt might be loose, so I took a look at them.
See how when the nozzle is moved in the X axis? The slack part make it loose 1mm before it actually move. This could explain the square shape.
Because the labists x1 mini does not provide adjustment screws, I had to disassemble it, stretch the belt and assemble it again.
![](https://konubinix.eu/ipfs/bafybeicdi4eajxcjarotiygofb7due446tov5jdknwcwe6a5evxko6op24?filename=2021_02_17t09_11_28_01_00.png)
The shape does not look perfectly circle to me, but at least it was enough circle for the magnet to fit into it.