Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

NelsonRap — Mon, 06 Jun 2011 00:31:50 -0400

Well just to report on this I am getting some pretty good prints now using Gen6 and SF41, I have upped the temperature on my heated bed that has glass on top and the results just keep getting better and better

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

Architect — Sun, 22 May 2011 18:48:05 -0400

Following

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

NelsonRap — Tue, 03 May 2011 22:44:32 -0400

I'm going to stick with Gen6 at least for the time being as I have it working well now

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

ahmetcemturan — Tue, 03 May 2011 02:52:39 -0400

@NelsonRap: What you do is not wrong. I just think that you dont get really that much speed on the extruder stepepr with Gen6.
Try lower settings and look whether you see any diffference in the retraction speed. You will probably not see any.
It also does no harm when you leave it @50.
I would advise you to switch to the Sprinter FW anyway as it is much better and faster. You can pull it from the git repository It improves print quality immensely..
[github.com] This version is the Original one..
[github.com] That's my version with a few details changed to make it more suitable for Gen6 electronics. Mainly the Config file is adjusted accordingly.

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

NelsonRap — Mon, 02 May 2011 16:06:36 -0400

I get frustrated when told wow that's big or wrong yet no alternative or a reason is given

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

syncra — Mon, 02 May 2011 06:16:33 -0400

@ brnrd: I use 30 and works ok. What values are you used to? Why do you think 50 is a too big number?

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

ahmetcemturan — Mon, 02 May 2011 06:13:08 -0400

Basically Gen6 with original firmware somehow has a limit on how fast the extruder stepper can run...
Not the case with sprinter FW..

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

NelsonRap — Mon, 02 May 2011 04:12:38 -0400

I don't know still learning all this stuff but 50 seemed to work just fine using a Wades extruder and Gen6 electronics

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

brnrd — Sun, 01 May 2011 23:10:59 -0400

That's 50 mm/s of feed? Does it really move that fast? What electronics and extruder are you using?

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

NelsonRap — Sun, 01 May 2011 22:21:03 -0400

Upped the retraction speed to 50 and that fixed it fine.

Thanks

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

ahmetcemturan — Sun, 01 May 2011 05:43:26 -0400

Wow thats big...
Btw: > a negative number. This means less filament is fed can cause you lack of PLA if you have a small part that has lots of retracts after short moves.

It looks that you have a really slow extruder retraction speed. Basically you have to retract faster than the filament oozes and get put it back before it starts oozing again.
That means :
You must retract filament as quick as possible,
you must move as fast as possible while filament is retracted to your new position( Be it only Z movement)
You must put the filament back to start position as fast as possible.

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

NelsonRap — Sun, 01 May 2011 01:46:12 -0400

OK I have a picture of the blob on the corner now have set the retraction settings but they are set quite small at the moment. Unfortunately I'm using clear PLA so it doesn't show up that well

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

NelsonRap — Fri, 29 Apr 2011 17:30:01 -0400

Will give it a go, thanks for all the feedback I feel I'm getting somewhere now

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

bbriggstkd — Fri, 29 Apr 2011 07:38:58 -0400

I have the first layer flow and feed set to 0.4 with the overall speed set to 15. The only way I could get things to stick was to change the first layer perimeter flow to 0.7. My layer height is 0.2, I'm going to try 0.25 to see if that helps. I read somewhere that skeinforge numbers may be off with layers of 0.2.

The perimeter is consistanly sticking now, I just need to get the infill to stick. About the 2nd or 3rd layer it starts pulling the build platform.

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

emt — Fri, 29 Apr 2011 05:01:47 -0400

*I am not getting any feed on the first layer now though since setting the Restart extra distance to -0.2.*

Are you using skirt? Set to 1 layer it will move any problems off the job and the first job layer should be OK.

If not careful use of initial splodge may help. Set operating splodge length to 0 to avoid it working on other layers.

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

rhmorrison — Fri, 29 Apr 2011 03:50:54 -0400

My end.gcode looks as follows:

G91                ;set relative positioning
G1 F50             ;set move speed to suit Z-axes
G1 Z5 F50          ;move up 5mm from the finished object
G90                ;set absolute positioning
G1 F2300           ;set move speed to suit XY-axes
G1 X100 Y200 F2300 ;move table out to remove object

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

epengr — Fri, 29 Apr 2011 03:13:35 -0400

> I would also like to tell the extruder to raise on
> the Z axis at the end of a print, I'm guessing I
> need to put some in the end code file

I use:

G92 Z0
G1 Z2 F70
G1 Y170 F1800 ;to bring the platform forward

You could probably switch to relative instead, but I have played with that.

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

NelsonRap — Fri, 29 Apr 2011 03:04:40 -0400

Printing is getting much better now, have lost the blob at the start of each new layer, just have slight bulging of the sides of my cube now. I guess this is too much infill.

I am not getting any feed on the first layer now though since setting the Restart extra distance to -0.2.

I would also like to tell the extruder to raise on the Z axis at the end of a print, I'm guessing I need to put some in the end code file

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

NelsonRap — Thu, 28 Apr 2011 20:17:50 -0400

emt Wrote:
-------------------------------------------------------
> You can set restart extra distance in Dimension to
> a negative number. This means less filament is fed
> at the start of each layer.

Thanks for that tip will give it a try later

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

syncra — Thu, 28 Apr 2011 14:19:46 -0400

Thanks epengr for your reply.

I actually kind of solved the problem working on the filament feed - I added some pressure squeezing the filament against the gear. This provides more force to push the filamnet into the hot end (I imagine) and avoids "eating" the external of the filament. In reality, this solution reduced the number of times that it happens, but still happens sometimes, luckily not noticeable as often during internal infill.

So it wasn't a problem of temperature I think, which I have now set to 200C for PLA.

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

epengr — Thu, 28 Apr 2011 10:28:10 -0400

syncra Wrote:
-------------------------------------------------------
> I believed it was a temperature problem but cannot
> find any temperature to work with (tried 170-200C
> every 5C for PLA and 240-265C for ABS).
> What I noticed is that sometimes the extruder gear
> "eats" the filament, like if the pressure is too
> high in the nozzle and cannot push the filament
> in.

I'm still a noob myself, but I have to run at 220-230 for PLA. I think this is getting the tip to ~185 real degrees and is probably sue to a questionable temperature table and possibly poor placement of the thermistor. I need to get my hands on a digital thermometer to verify.

Anyways, at 230, PLA prints great with no burning, popping or discolouration. I'd slowly take it higher and see how it goes.

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

brnrd — Thu, 28 Apr 2011 08:52:59 -0400

You have to slow down the feed and flow rate on your first layer feed and fjow multiplier in the raft settings less than 1. I've never tried acrylic so I don't know how fast you can go. On heated kapton, I usually print at 20 mm/s and I have them set to either 0.5 or 0.75.

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

bbriggstkd — Thu, 28 Apr 2011 07:41:36 -0400

I"m still struggling with settings. If I can get my first layer to stick there is too much plastic and it creates ridges in the infill. If I get the infill looking good, it won't stick.

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

syncra — Thu, 28 Apr 2011 06:34:41 -0400

Hi all,

I am running into new troubles... After having my extended huxley working fine, I changed few things, among which the extruder motor and the material, and now I cannot print any more! I tried to get back to the original system but it keeps the same problem, which I believe is common but I cannot solve. Please help if you know what this is about.

When depositing whatever, the line deposited becomes little bits of material or the extrusion stops, then starts again being very irregular.
I believed it was a temperature problem but cannot find any temperature to work with (tried 170-200C every 5C for PLA and 240-265C for ABS).
What I noticed is that sometimes the extruder gear "eats" the filament, like if the pressure is too high in the nozzle and cannot push the filament in.

I currently use the following:
- mendel-parts hot end v4 (the classic brass nozzle with heater block/power resistor and PTFE insulator on top)
- a modified WADE extruder with a brass insert as worm gear
- in alternative to the above, a home made NEMA23 extruder with an aluminium gear in direct drive

The problem is always the same, independently of material, temperature and extruder type.

Any idea? I start thinking I have a problem in my skeinforge settings, that's why I'm posting here.
Thanks

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

emt — Thu, 28 Apr 2011 05:59:14 -0400

You can set restart extra distance in Dimension to a negative number. This means less filament is fed at the start of each layer.

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

NelsonRap — Thu, 28 Apr 2011 03:02:19 -0400

I'm getting the same as AgeingHippy a glob at the start of each new layer. I tried upping the retraction and it made no difference.

Any ideas out there?

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

bbriggstkd — Wed, 27 Apr 2011 17:21:08 -0400

I'm still working out the kinks but I'm making progress.

In my experience if the first layer is not sticking it either because the flow is too low or the head to too high. There is a setting in Raft "nozzle lift over layer thickness", it appears that this is how high the head is lifted off the build platform from the Z Home position.

If you having an issue with blobs, you might try to adjust the Dimension Retraction settings to pull the filament back when the head is moving.

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

epengr — Wed, 27 Apr 2011 14:01:27 -0400

> Now I have a tuned setting and can change layer
> height with one or two numbers and print...
> easy..

Did you ever sort this out? I'm seeing the same thing and I was thinking my flow rate's too high (My figures are all fudged right now, I'm going to calibrate it "right" soon - I'm just transitioning from Repsnapper to sf.)

I thought, if the flow was a little too high then pressure could build in the melt chamber and as soon as the z lifts it releases a blob...

maybe?

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

bbriggstkd — Mon, 25 Apr 2011 07:35:21 -0400

I'm still not having any luck. I've adjusted the Z home height but I'm afraid if I lower it any more, it will plow into the build platform. I've set he perimeter width/thickness form 1.5 to 1.7. t's still not sticking.

Should I bump my layer thickness up from 0.20? I've got a .35mm nozzle.

Re: Skeinforge 40 Changes to Dimension - Read this for problems with the new version of Skeinforge!

bbriggstkd — Sun, 24 Apr 2011 13:47:43 -0400

Sorry, I should have given those details.

I'm printing with ABS on an acrylic sheet.

My Z home looks ok to me, the raft is sticking better now. I increased the width/thickness ratio on the base and interface layers and that helped. The first layer perimeter still didn't stick though. I had the perimeter flow and feed set to 1.1 in the Speed settings. I've dropped that and will run another test.

After the first layer, things seem to be sticking together. I let it run and it looks like only the first layer is having problems. There was a bit too much plastic on the infill but I changed my packing density and will see what that looks like. I may need to check with/thickness on infill too. However, I need to get the first layer sticking first.