Comparing the effects of various print speeds

[deckingman]

I'm running some tests with high speed printing and would like to ask the community what comparisons they would like to see made between the test parts.

So far I have:

Surface finish - visuals via close up photos and videos - sorry, I don't have a microscope.

Overall dimensional accuracy - measured in X and Y at both close to the base and close to the top (Z=10 and Z=390 of a 400 mm tall object).

Wall thickness. The test objects were printed with 3 perimeters, no infill. I have taken 3 to 4 readings on all 4 flat faces as well as 3 to 4 readings around a curve and recorded the minimum and maximum of each "facet", and then calculated averages.

Corner bulge amount. i.e. if the corners bulge, how far out from the flat surface that bulge is.

Part strength / layer adhesion comparison. I could do with some help here as to the best way to evaluate and compare these in some sort of scientific manner (given that I don't have access to any sophisticated machines). So, squeezing in a vice and measuring the compression before it breaks, or some such.

I'm not looking for numerical values, just comparisons between objects. Test can be destructive.

Anything else that people would like to see?

[garyd9]

Stringing: Some people say faster moves reduce stringing, others suggest that faster increases stringing. (Then there are those that suggest slower printing and faster non-printing moves is the key.)

Inner dimensions (as opposed to outer dimensions.) Model a 10mm diameter circular hole in an object and compare the hole size and shape with fast vs slow printing.

[brunofporto]

@deckingman said in Comparing the effects of various print speeds:

sorry, I don't have a microscope.

A friend of mine bought this: https://www.surplusshed.com/pages/item/L3275.html

This is one the most beautiful little things I've ever seen. It magnifies 11x without any distortion up to the edge of the lenses. Then he asked me to design some type of holder for it, which I did: https://www.thingiverse.com/thing:3098792

I can see up to scratches at the extrusion due to old nozzles for example.

[deckingman]

Thanks for the suggestions guys.

The parts are already printed but I guess I could produce more if there is a real need.

I forgot to mention that I'm talking seriously fast print speeds. So the objects need to be big in order for the move length to be long enough to attain the speed. This is more about melt rates, kinematics, frame stiffness, vibrations etc than anything else.

Edit. So small holes will just break up the moves and the maximum speed probably won't be attained.

Also, I need to be able to provide photos or videos because nobody believes anything I say. I do have a big illuminated desk top magnifier so I'll see what I can do with that and a camera.