BerryBot3D
Posts: 4
Joined: Mon Dec 01, 2014 1:20 am

Extrusion Multiplier for first layer Please

Thu Dec 29, 2016 6:45 pm

I would love to see the (Extrusion Multiplier) available on the first layer settings like below:


Image

CompoundCarl
Posts: 2005
Joined: Wed Aug 05, 2015 7:23 am

Re: Extrusion Multiplier for first layer Please

Fri Dec 30, 2016 5:12 am

I think this already exists using the fist layer height. If you make it 200% for example, it extrudes twice as much plastic. Then you can use the global Z-axis offset to shift the layer up and down until you get the right amount of "squish" for that first layer.

dennisjm
Posts: 342
Joined: Wed May 07, 2014 9:51 pm

Re: Extrusion Multiplier for first layer Please

Sat Dec 31, 2016 11:00 am

Just increase the first layer width.

BerryBot3D
Posts: 4
Joined: Mon Dec 01, 2014 1:20 am

Re: Extrusion Multiplier for first layer Please

Thu Jan 05, 2017 6:13 pm

Dennisjm increasing the first layer width will not actually add plastic. I think the program will recalculate volume but just stack it closer together? Great idea dealing with the global Z, however, I still think it would be a great option to have in the program?

User avatar
dkightley
Posts: 2080
Joined: Tue Mar 10, 2015 4:09 pm

Re: Extrusion Multiplier for first layer Please

Fri Jan 06, 2017 5:05 am

The requested feature is already partially implemented in a different way....

KeyboardWarrier's Tip of the Day 4 thread states:
First Layer Settings (These are applied to where the Bed touches your model. If you have a raft, that means the First Layer Settings will apply to your raft).

First Layer Height: This % will take a % of your Primary Layer Height. If you are printing with a small Primary Layer Height like .1 mm I would recommend a First Layer Height of 250%, to get about a resulting .25 mm first layer height

If your First Layer Height is below 100%, the extrusion amount will remain the same, only the Z-will change, but if you increase above 100%, the extrusion amount will scale accordingly.

First Layer Width: the extrusion width of your first layer, you may find that your first layer sticks better with a thicker extrusion (100%+). I don't have too much experience with this, but I think 125% or 150% would be good starting points.

First Layer Speed: Slows down the First Layer Speed to a percentage of your Default Printing Speed (Other tab)
So.....to increase the amount of plastic being extruded relative to the layer height on the first layer....ie increase the extrusion multiplier....simply reduce the layer thickness below 100%.

Personally, I adjust layer thickness and global-z position in combination to achieve exactly the same result....which I'm perfectly happy with. I would prefer to see development time being used to make changes that can't be done any other way (other than using a different slicer) - like sorting out thin wall behaviour!
Doug Kightley
Volunteer at the National Tramway Museum http://www.tramway.co.uk
Railway modeller and webmaster at http://www.talkingtgauge.net

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