26

Re: My prints suck... So I emailed tech support...

Now, after checking my flow rate via a thin walled cube, I've noticed that prints completed with RH/Slic3r look pretty good, but I can rarely complete them as the first layer rarely sticks properly (some winds up dragging behind the nozzle, botching following layers) and when it does, I will get several layers in & the print will start sliding all over the bed. In Pronterface I get some edge peeling but usually the print sticks, if not, I use a raft with a large base and although the raft lifts slightly around the print, it stays put & produces a low res, lined, ugly print.
My hot end stays around 200, my bed starts off (I've experimented) over 100, usually 110 is what I wait for, as it drops down to roughly 100 (generally 98 is the magic number).
I would love to use Slic3r, but just can't get prints to stay put on the bed like I can (with finagling) with Pronterface. Any professional pointing in the right direction my fellows?

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27

Re: My prints suck... So I emailed tech support...

You might need to adjust the Z tab going back and forth between SLic3r and Skeinforge.  They might be set to treat the first layer differently, one expecting the bed to be positioned at first layer height, and the other expecting the bed to be at 0 then moving up to the first layer height.

28 (edited by iowajames 2013-03-06 21:29:47)

Re: My prints suck... So I emailed tech support...

IanJohnson wrote:

You might need to adjust the Z tab going back and forth between SLic3r and Skeinforge.  They might be set to treat the first layer differently, one expecting the bed to be positioned at first layer height, and the other expecting the bed to be at 0 then moving up to the first layer height.

In RH? Forgive my lack of knowledge. It's funny, I can write a program in G code, (Fanuc II) for a large VMC and machine a complex part, yet I feel helpless as a babe when I'm messing with this. I suppose it has a lot to do with familiarity and practice.

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29

Re: My prints suck... So I emailed tech support...

iowajames wrote:

I use a raft with a large base and although the raft lifts slightly around the print, it stays put & produces a low res, lined, ugly print.
I would love to use Slic3r, but just can't get prints to stay put on the bed like I can (with finagling) with Pronterface. Any
professional pointing in the right direction my fellows?

You could try using a large Brim in Slic3r (say 5 mm) and forcing the print speed for the first layer to be 25% of normal.  Also, get the extruder close to the bed, so that you can barely push a piece of printer paper between the nozzle and the bed; and then adjust the Z screw (on the back of the printer) to raise the bed just a hair.  The first layer needs to be pressed pretty firmly onto the bed.

What kind of bed surface are you using?  Kapton?  Many of us  use a glass plate with lots of hair spray.

Good luck

30

Re: My prints suck... So I emailed tech support...

iowajames wrote:
IanJohnson wrote:

You might need to adjust the Z tab going back and forth between SLic3r and Skeinforge.  They might be set to treat the first layer differently, one expecting the bed to be positioned at first layer height, and the other expecting the bed to be at 0 then moving up to the first layer height.

In RH? Forgive my lack of knowledge. It's funny, I can write a program in G code, (Fanuc II) for a large VMC and machine a complex part, yet I feel helpless as a babe when I'm messing with this. I suppose it has a lot to do with familiarity and practice.

Z-tab is the screw in the back of the solidoodle that contacts the z-endstop switch. Basically back it out a turn or so, so there's less gap between the nozzle and bed.

31

Re: My prints suck... So I emailed tech support...

Ztab adjustment video here:

32

Re: My prints suck... So I emailed tech support...

Wow, thanks for the explanation & the linked video. That helped adhesion %100. Let's see if this print sticks the whole time. Will post later.

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33

Re: My prints suck... So I emailed tech support...

Update: Nope. Here's the spaghetti I made:
https://sphotos-b.xx.fbcdn.net/hphotos-ash4/406360_569892366356015_1234780784_n.jpg

I did as the video said, and my first layers are mega thin, but my nozzle isn't scraping kapton, should I slow down the base layer speed then? Also, I was trying to make an Emmett bearing ( http://www.thingiverse.com/thing:53451 ) and the bearing I started printing here was solid, whereas the one I successfully printed (early on in low res) via Pronterface was stuck, but once I broke it loose, it moves (grudgingly).
Some folks are saying I need to change the tolerance in RH, I've scoured it & will have another look in the morning, but I can't find a way to change the tolerance in RH/Slic3r.
I think the enclosure that I'm attaching (copycat of the ones with the domed party dish cover, except mine has 1/2" thick sides) will help with adhesion during the print, just gotta get this thing fine tuned now.

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34

Re: My prints suck... So I emailed tech support...

Ok, I just read through this thread again and got one question... have you cleaned the kapton surface? and if so what did you use? If your print is getting knocked off that easy I think the kapton may be contaminated with body oils, grease, etc... the best thing to clean it with is acetone if you don't have that try isopropyl alcohol if that is not on hand try any good dishwashing liquid soap that cuts grease.

I came to this conclusion from the last pic you show a great looking first layer(whats left of it)...although it is a little thin... probably need to lower the bed just a tad wink but besides that unless your extrusion multiplier is set way high and causing massive buildup for the printhead to try and push around an object like the bearing should have stuck really good and actually hard to remove... unless your gcode is turning off the bed heater after the first layer??? sorry about the rambling just kinda thinking out loud smile

35 (edited by saymo606 2013-03-07 12:35:08)

Re: My prints suck... So I emailed tech support...

are you using glass on your bed?

if not and your bed is warped, it will clog the nozzle causing skipping...

glass and hairspray> one of the best upgrades there is!

36

Re: My prints suck... So I emailed tech support...

I had cleaned the bed a few times with an LCD alcohol wipe, but hadn't considered using acetone on the Kapton, I will do that later. I will also (hopefully) finish putting my acrylic case on. Tanks, will post back with results.

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37

Re: My prints suck... So I emailed tech support...

iowajames wrote:

I had cleaned the bed a few times with an LCD alcohol wipe, but hadn't considered using acetone on the Kapton, I will do that later. I will also (hopefully) finish putting my acrylic case on. Tanks, will post back with results.

A number of posts recommend lightly sanding the platform with 400 or 600 grit sandpaper to enhance sticking.  I did notice myself that after my kapton got scuffed up from regular normal use that prints began sticking well (now often a little too well) to the bed.

38

Re: My prints suck... So I emailed tech support...

I wouldn't suggest hand sanding the platform, I think what you may have read is that people were lapping the bed flat, which is laying the fine grit paper down on a known flat surface and running the plate over that paper. 

I haven't read of people just scuffing up the aluminum bed and using it bare.

I'm telling you and everyone else, go to glass and hairspray.  There's a reason why most of the seasoned users are doing it already.  I only wish I would have done it sooner so my earlier prints didn't look so bad sitting around the house.

39

Re: My prints suck... So I emailed tech support...

Scuffing the kapton works well on my past printers - I believe that's what was meant.  A good cleaning with isopropyl and a light scuffing as mentioned worked wonders.

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40 (edited by tealvince 2013-03-07 16:12:34)

Re: My prints suck... So I emailed tech support...

cmetzel wrote:

I haven't read of people just scuffing up the aluminum bed and using it bare.

Sorry, I meant lightly sanding the kapton tape so it's not so slick.  After my kapton got scuffed up, I stopped needing to add brims to most of my prints and now even have a little difficulty removing prints when they are done.

41 (edited by cmetzel 2013-03-07 16:10:24)

Re: My prints suck... So I emailed tech support...

Okay you scared me there.  haha   I could see future newbies taking sand paper to their beds and really creating some problems.

42

Re: My prints suck... So I emailed tech support...

Wait. I'm not sposed to sand the aluminum? Um. K.
:-p
Just kidding. Thanks for the help, will post pics after I finish my enclosure. I'm using 1/4" thick door and window foam insulation, cut to fit the various obstacles in the path around the openings. I also just received my party tray from Amazon.

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43

Re: My prints suck... So I emailed tech support...

IanJohnson wrote:

It might make the dimensions slightly larger than they should be, but would be consistent in its effect.

So in the rush of things, I am unsure if the user ever problem fixed. Is this still an issue? Perhaps there is something support can do.

Former Solidoodle employee, no longer associated with the company.

44 (edited by iowajames 2013-03-11 14:24:05)

Re: My prints suck... So I emailed tech support...

solidoodlesupport wrote:
IanJohnson wrote:

It might make the dimensions slightly larger than they should be, but would be consistent in its effect.

So in the rush of things, I am unsure if the user ever problem fixed. Is this still an issue? Perhaps there is something support can do.

My emails were with John and I don't know yet. Still working on case mod.

Edit: Case is done.

http://www.soliforum.com/post/15984/#p15984

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45 (edited by iowajames 2013-03-14 17:36:25)

Re: My prints suck... So I emailed tech support...

Did the spring loaded z-backlash fix & have done every calibration, yet I still have nasty banding in my prints. This sucks.
http://img.photobucket.com/albums/v651/jaythedogg/bad.jpg

The banding is equal on all sides, so I know it's not an X or Y shift issue. o.O

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46

Re: My prints suck... So I emailed tech support...

At this point, I'd point at the lead screw for the z-axis.  If you can get a video of the top of the screw as you raise and lower the bed 50-60mm, check to see what the top of it looks like.  I can almost guarantee that thing will be waving.  You don't see it in small increments, but at gross movement it should be relatively stable.  If not, that sucker is bent.

If it shows this, contact support and supply the image you posted and the video of the screw movement.  If that ain't enough proof that your screw is bent... they're bent

47

Re: My prints suck... So I emailed tech support...

You said that you made all the calibrations: have you also tried the firmware z-wobble compensation?

48

Re: My prints suck... So I emailed tech support...

Rincewind wrote:

You said that you made all the calibrations: have you also tried the firmware z-wobble compensation?

No, but those settings are fine tunes for wobble compensation, this isn't in need of a fine tune yet, it needs fixed first.

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49

Re: My prints suck... So I emailed tech support...

Yes, your wobbling is pretty bad, but it's really the kind that would benefit from the firmware compensation. You already removed the other sources of errors and you only remain with periodic uneven layer height. I would give the firmware a try if I were you.

Otherwise, from a hardware standpoint, I think you should try stopping the Z motor from going up and down.

50 (edited by iowajames 2013-03-14 18:17:53)

Re: My prints suck... So I emailed tech support...

Video: http://smg.beta.photobucket.com/user/ja … 5.mp4.html

Edit:

The wood squawk noise you hear when the table is low happened at 60 away from home once, then at 80 once. And even lower until I moved past those points in a previous test. It is greased properly. I'm just concerned that I have bigger problems.

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