Photos of underextrusion and overextrusion plus flow-rate

[geert_2 557]

Some time ago I made a series of tests to see what different percentages of underextrusion and overextrusion would look like. Here are some photos. The percentage of the flow-rate is written on the model, thus "30" means a flow rate of 30%.

 

So when experiencing underextrusion or overextrusion you can guestimate the amount by comparing it to these tests. Best is if you first run these tests on your own machine on a moment when it is good, with your own materials. So you can compare later on. There may be differences between machines, and materials.

 

Sharpness of the photos is not optimal due to not enough light, and thus a big lens opening and not enough depth. But you get the idea. Next summer when there is a lot of daylight again, I will make better photos.

 

Material is colorFabb PLA/PHA, color "warm red". This filament is slightly translucent, which reduces contrast. I should have taken a color that was totally opaque...

 

The "big" block on the left is 10mm wide, nozzle 0.4mm.

 

Flow-rates of 100 and 110% look best. Below there are gaps and sort of sponge-patterns. Above lines start to get too thick near corners. At 150% I stopped the test prematurely due to too much overextrusion (didn't want to do damage).

 

File: flowtest2.stl

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Edited December 5, 2018 by geert_2
Clarified a few things

[Smithy 1,144]

Very useful and interesting, many thanks for your effort!