Calibrating two full AMS
After a while I decided to add a second AMS to my printer because four colors somehow were not enough. - I am certain eight will do … for a while.
My standard filament is PETG and that is what has been used here.
One AMS filled with white (BL), grey (Prusa), black (BL), orange (BL) and the other AMS with red (BL), yellow (Prusa), green (?), blue (BL).
That simply is my compromise to get most of my preferred color shemes and also have the colors that are preferred by the kids at hand at all times.
Of course I went to town and determined the necessary flushing volumes for all 56 possible color changes (of course with my modified G-code applied) and compared them to the auto-calculated values from Bambu Studio.
Auto-calculated flushing volumes (+45mm³ prime volume not included)
Manually calibrated flushing volumes (no prime volume required)
The difference
with
negative volume = BS underestimated how much flushing was needed
positive volume = material that would have been wasted
Put to words:
- On average around 110mm³ (+45mm³ if you include the prime tower) of filament is saved per change.
- 9 out of 56 changes were off by more than 200mm³. (In BL’s defence, not all was Bambu filament - but even within those changes they were off in half of the cases…)
- 4 out of 56 changes were insufficient and needed more flushing
- In addition to the expected low flushing volumes required to switch between “neighboring” colors such as orange and red, changes between yellow and green are also very efficient and only require 30 mm³ more material.
- As expected changes to white or from black consistantly need the most flushing volume.
Savings in print time have to be tested separately,
If you want to do this calibration as well, simply use the “Two AMS” profile provided within my calibration v1.
The printouts are distributed across 4 plates, with plate 1 and 4 resembling the calibration of each full AMS
and plates 2 and 3 containing the changes across both AMS units.
To facilitate the evaluation and documentation of the results, I also attached a PDF file that provides a predefined table to fill out.