Eliminate VFA on the Snapmaker U1 (for free)

U1 Toolchanger
1

Sharing my reddit post here for more exposure:

2

Why not copy and paste it here? Would be greatly appreciated.

3

From Reddit:

I was suffering from significant VFAs with my U1 using the default print profile. I found a way to reduce the VFAs significantly using just slicer settings in Orca. (I believe the VFAs will improve even further by changing to a 0.9 deg stepper, which I’m still waiting for some brave souls to embark on.)

You can see the results of the tuning from the video above. I found the improvement to be significant, especially since it’s “free”.

Pre-Tuning

Start by checking using the built-in VFA test under the calibration menu in Orca, starting from 100 to 300 mm3/s. You must ensure that your filament flowrate supports the highest speed by changing the max voulumetric speed (temporarily) in your filament setting to an arbitrarily high value (say, 200 mm3/s). If not, the VFA test will be invalid because it will be flowrate limited. To ensure that my U1 can sustain the high flowrate, I had to change all my line widths to 0.4mm as well.

After your VFA print is done, examine the output. In my case, there was significant VFA in the 120 to 180 mm/s range. The VFA got much better around 200-210 mm/s speed. I think higher speeds would have been even better but it is not sustainable with the current hotend (until a high flow hotend is available).

Change settings

Once you determine the minimum speed required to eliminate the VFA (in my case, I chose 210mm/s), you will need to change the settings in Orca as follows:

  • Outer wall line width: 0.4mm
  • Inner wall line width: 0.4mm
  • Walls printing order: Inner/Outer/Inner
  • Outer wall speed: 210 mm/s
  • Inner wall speed: 210 mm/s

You should see a significant improvement in the VFA after these changes.

4

Why, it’s in the link above.

5

Because not everyone has an account or wish to land on a Reddit webpage. Also, why go out to another site when you can view the solution here?

NOTE:
If you select Walls printing order: Inner/Outer/Inner the “Precise Wall” checkbox under Quality → Precision will be ignored.