Progressively worse accuracy along X and Y axis
Hi,
Last week I was printing a model that i made, it is basically a square with square holes at each corner. In the holes i have printed bars that go in.
I Noticed that the holes on one side was a perfect fit, the bar could move free, but on the other side the bar didn't go in. I did some investigation and it turns out that the furter along the X axis and Y axis I print the holes the worse it gets. I used extra clearence on this model to avoid this kind of problems. I did some investigate and have done the following:
- Maintenance, lubrication etc.
- Squaring the XZ, YZ, XY axis according to prusa manual
- Tensioning the belts according to the prusa app
None of them worked. I wanted to get more data on this issue so i printed 6 20x20x20mm cubes (lots of fillet in the corners to avoid bulging), 3 equally spaced on the top row and 3 on the bottom row (TL = Top Left, TC = Top Center, TR = Top Right etc....)
TL-----TC-----TR
| |
| |
BL-----BC-----BL
Meassured the X, Y and Z values of each of these positions
TL: X = 20.21, Y = 20.11, Z = 20.11
TC: X = 20.14, Y = 20.04, Z = 20.13
TR: X = 20.04, Y = 19.94, Z = 20.08
BL: X = 20.17, Y = 20.15, Z = 20.05
BC: X = 20.02, Y = 20.00, Z = 20.06
BR: X: 20.00, Y = 19.98, Z = 20.04
Difference in X between Left and Right cube are around 0.16 mm
Difference in Y between Left and Right cube are around 0.17 mm
I know a 3d printer is not super accurate but what is strange to me is that it is not consistent, it varies with the distance along the axes.
Is this normal? Any suggestions on how to fix it?
I have had this printer for 5 years now, maybe it is just old.