Setting up Cartesian Printer.

[deckingman]

@dc42:

Perhaps we should start a club for Over 60's 3D printing enthusiasts? I'd be eligible too!

Good idea. Will that mean concessions get a discount on Duet products?

[iDevelo]

@deckingman:

@iDevelo:

OMG - old farts club!

No flatulence problem here son.

[Corexy]

Steady on….I'm 47...which my sons assure me qualifies my entry into any old farts clubs.

[deckingman]

@Corexy:

Steady on….I'm 47...which my sons assure me qualifies my entry into any old farts clubs.

Nah, your just a young slip of a lad.

[Dougal1957]

Still think we should push for an Age Concession Ian? (Very tongue in cheek LOL)

Doug

[Corexy]

So I'm trying to dial in my extrusion properly.

I've done the 100mm extrusion and am getting a constant and repeatable 120steps/mm for my extruder motor. Quite confident that is set correctly.

My understanding is that once that is done, I need to measure the diameter and work out my extrusion multiplier for each different type of filament I use, and enter the value into my slicer (S3D in this case).

I've entered the filament diameter (1.714mm, averaged over 5 points) and printed a single walled hollow test cube in 0.1mm layer height to measure the real wall thickness, which was set on manual 0.48mm.

Came out very nice, but is 0.55mm thick.

Is that excessive? How do I calculate my extrusion multiplier setting? It's set a 1.0 at the moment.

If I divide the difference (0.07mm) into 0.48, I get 6.86.

So do I just set my multiplier at 0.9314 and try it again?

Does this setting work over all layer heights?

[dc42]

I don't bother measuring the filament. I just put 1.75mm and extrusion multiplier 1.0 into the slicer, do a test print, and adjust the extrusion factor in the slider on the web interface to get good top solid infill. Then I make a note of the extrusion percentage shown in the slider, and use that value in future for that roll of filament. Ignore the single-wall thickness, it isn't a good test.

[Corexy]

@dc42:

I don't bother measuring the filament. I just put 1.75mm and extrusion multiplier 1.0 into the slicer, do a test print, and adjust the extrusion factor in the slider on the web interface to get good top solid infill. Then I make a note of the extrusion percentage shown in the slider, and use that value in future for that roll of filament. Ignore the single-wall thickness, it isn't a good test.

So I tried this and got these results.

I did still have my own filament diameter entered, forgot to reset it to 1.75mm, but used the extrusion bar on the DWC to make adjustments on the fly.

Percentages are written on them, which do you all like?

[deckingman]

Personally, not terribly keen on any of them. Just for the hell of it, try dropping the extrusion in 5% increments until you get obvious under extrusion and see how the finish looks. This is the subject of another thread I've started but for some as yet unexplained reason, I'm getting best results using 70% extrusion with everything calibrated and triple checked. (Yeh, weird I know).

[Corexy]

@deckingman:

Personally, not terribly keen on any of them. Just for the hell of it, try dropping the extrusion in 5% increments until you get obvious under extrusion and see how the finish looks. This is the subject of another thread I've started but for some as yet unexplained reason, I'm getting best results using 70% extrusion with everything calibrated and triple checked. (Yeh, weird I know).

So these are all over extruded?? Definitely don't want to go higher than 100%?

Funnily enough the ABS setting was definitely under extruded at 90%

I probably was going a bit soft on the increments at 2% change per time, I'll try it a 5% changes.

Your end of print script worked nicely by the way, cheers for that.

[deckingman]

It may be OK - just try what I suggested for the hell of it - it worked for me but nobody has as yet come up with an explanation as to why I need to run like this..

[deckingman]

For info, here is what I get https://drive.google.com/drive/folders/0B_MwtHtQR_ZveVpCazlzbjRsQlk?usp=sharing with extrusion at 70%.

[Corexy]

I'll take my extrusion multiplier results over to Deckingham's post, because I'm getting similar results.

Regarding ending script, this is working well for me, bearing in mind I home all axis' in the start script:

G90
G1 Z175 F360
G90
G1 X5 Y190 F800
M104 S0 ; turn off extruder
M140 S0 ; turn off bed
M84 ; disable motors

I'd just like to shut down the print fans on completion as they're pretty noisy.

The heat break fan shut's down when the extruder temp drops below 45 degC, and I'd like to keep it that way.

Could someone please help me out with a line of script to add to that that will shut down the slicer controlled print fan?

**I've gone with "M106 P0 S0 ; turn off print fans", please correct me if I'm wrong.

[dc42]

M106 P0 S0 is correct.

Most people use M0 to end the print.

[Corexy]

@dc42:

M106 P0 S0 is correct.

Most people use M0 to end the print.

I think that was mentioned above….would that shut down my heat break fan as well?

I'd like to leave that running until it all cooled down as I have a teflon insert in my hot end and I'd just rather see it turn off once the temp was down to 45.

[dc42]

M0 will not shut down any fans.

[deckingman]

Just to clarify, as David has said, M0 will not turn off any fans (nor will it turn the motors off). AFAIK, all it does it turn off any heaters so you could use it to instead of the M104 and M140 commands in your end G code. So, yes you still need M106 P0 S0 to turn off the print cooling fan. There is a caveat to that - it assumes that P0 is your print cooling fan as defined in your config.g (it usually is). Also, the hot end fan is usually P1. It's a good idea to keep that running in thermostatic mode as you are doing and not turn the machine off until it stops. Not only because of the teflon insert but also because if you turn it off too soon, you could get heat creep back up the heat sink which will soften the plastic. That will then solidify and cause a blockage the next time you try to use the machine. This is the voice of personal experience:)

BTW Just be aware the using M84 to turn off the motors will mean that the machine will need to be re-homed before another print. Not a problem if you have a homing command (G28) in your start gcode but if not, it'll bite you in the *rse at some time (again the voice of experience:)

[Corexy]

OK,

So M0 will turn off the motors, bed and extruder heater?

Then I can use my line to turn off my print fan (yes I have it set up as mentioned above, thanks for the heads up)?

And yes I have a home all in the start code, thanks again.

So I could just have:

G90
G1 Z175 F360
G90
G1 X5 Y190 F800
M0
M106 P0 S0

And that would be all proper job?

By the way…

If I have an extrusion multiplier of 0.85 set in S3D, should the extrusion setting on my touch panel/DWC say 85% or 100%?

[dc42]

You can customise what M0 does by creating a stop.g file. By default it turns all heaters off and sets all motors to idle current (because on some delta printers, turning the motors off may cause the head to drop). M0 must be the last command in the file, because no further commands in the file will be executed.

[Corexy]

@dc42:

You can customise what M0 does by creating a stop.g file. By default it turns all heaters off and sets all motors to idle current (because on some delta printers, turning the motors off may cause the head to drop). M0 must be the last command in the file, because no further commands in the file will be executed.

I'm happy with the default settings, so:

G90
G1 Z175 F360
G90
G1 X5 Y190 F800
M106 P0 S0
M0

All good?

As well please: If I have an extrusion multiplier of 0.85 set in S3D, should the extrusion setting on my touch panel/DWC say 85% or 100%?