Cones of Calibration?

[dnl42]

I'm learning to use my Saturn 4 Ultra. As a part of that exercise, I've been trying the 'Cones of Calibration', which is supposed to help calibrate the print settings. My first print had correct results on the 'success' and 'failure' cones. The 'attunement' measurement was a tad oversize, and neither the 'ale' nor 'sword' fit. Per the instruction, I reduced the exposure in a couple of steps and now the measurement is spot on. I found a 2.1s exposure for Elegoos' Standard V2.0 resin provided dimensional accuracy on the 'attunement' block.

 

Sadly, the 'ale' and 'sword' still don't fit. Worse, the interference feels very similar across all exposure steps, But, thinking more about those two tests, they use a printed hole to test a printed solid. Recalling my physics and material studies, as a material expands or shrinks, a hole and a solid will expand by the same amount. So, while the 'ale' and 'sword' were shrinking, the test openings were also shrinking. 

 

Has anybody successfully used this test? What were your results? Did you use something else to calibrate your printer?

[PeteH1969]

I have used the cones and the Double Rook that came with the printer and the rooks printed very well as did the cones the two rooks should lock together on the tops and is an almost seamless joint.

 

I'm printing using a Saturn 1 and Anycubic water wash resin.

 

 

[dnl42]

Thanks @PeteH1969.

 

Elegoo don't provide a 'double rook', but they do provide a model of each chess piece. I printed the rook first thing--it printed beautifully after one false start. I just measured the castellations, and I see they should fit together nicely. I also looked at Elegoo's settings spreadsheet, they indicate an exposure range of 2.5-3.0s. So I decided to ditch the exposure adjustments based on the cones and go back to the original 2.5s.

 

Now it looks like I need to bump up the curing time as some slender parts that I printed yesterday have warped. Yesterday I was concerned about over-curing; my reading this morning indicates I only need to worry about under-curing under UV lights.

 

I'm getting there.

[PeteH1969]

1 minute ago, dnl42 said:

Thanks @PeteH1969.

 

Elegoo don't provide a 'double rook', but they do provide a model of each chess piece. I printed the rook first thing--it printed beautifully after one false start. I just measured the castellations, and I see they should fit together nicely. I also looked at Elegoo's settings spreadsheet, they indicate an exposure range of 2.5-3.0s. So I decided to ditch the exposure adjustments based on the cones and go back to the original 2.5s.

 

Now it looks like I need to bump up the curing time as some slender parts that I printed yesterday have warped. Yesterday I was concerned about over-curing; my reading this morning indicates I only need to worry about under-curing under UV lights.

 

I'm getting there.

Ok great.

 

When I said double rook the test print file from Elegoo had two rooks in the one file to test print rather than a physical double rook sorry my fault calling it a double rook.

 

Here are my settings in chitubox 2 basic, they may help you.

 

Pete