Z Lift on Start of Loop Path due to Shrinkage Settings

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SimonSplat
Posts: 1
Joined: 16 Jan 2018, 10:33

Z Lift on Start of Loop Path due to Shrinkage Settings

Post by SimonSplat »

Hey Guys,

Started using the material shrinkage settings in the Material tab to automatically inflate the gcode to take into account shrinkage. I noticed something weird when it was printing, a few layers up the extruder started to lift and lower at the start of the loop paths. As the model printed out and the height increased the z lifts were getting larger!

After some playing around I found it was being introduced due to the material shrinkage settings, when I set them to 0 the lift dissapeared, and looking at the gcode this was seen.
With shrinkage settings set:

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'Loop Path', 0.4 [feed mm/s], 15.0 [head mm/s]
G1 X24.209 Y10.289 Z0.2104 E4.55321 F30000
G1 X24.209 Y10.289 Z0.2051 E4.55321
A lift of 0.0053mm (not noticeable but it's there and gets worse higher up on the print- see later)

Without shrinkage settings set:

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; 'Loop Path', 0.4 [feed mm/s], 15.0 [head mm/s]
G1 X25.565 Y9.712 E18.52766 F30000
This next excerpt shows the z lift getting bigger as the height of the model increased:

Code: Select all

; 'Loop Path', 0.5 [feed mm/s], 18.2 [head mm/s]
G1 X29.231 Y8.486 Z86.259 E1.73942 F30000
G1 X29.231 Y8.486 Z84.1026 E1.73942
This gives a lift of 2.1564mm

It seems weird that this happens due to material shrinkage settings so am reporting it as a potential bug. Can anyone else confirm this please?

I'm using KISSlicer 1.62 Pro.
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