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05-26-2015, 06:09 PM #1
- Join Date
- May 2015
- Posts
- 48
Is it normal for raft-less prints to have this Tron-like texture?
I have a M3D Micro and lately have been having a hell of a time getting larger prints to print correctly. Without a raft they tend to lift, with a raft... I can't get the raft OFF even with X-Acto knives if it has a large surface area on the bottom. Even when printing with PLA, I tend to get lifting no matter how low or high I set my temperature.
Even when I do manage to get it to print without lifting without a raft though.... the bottom is hardly flat, and sometimes even missing areas that should be filled in. Does the bottom later of a raftless printout look like this to anyone else? Is it normal that it has all these thick lines on the bottom layer when raftless instead of looking smooth?
http://i.imgur.com/9OdHWdv.jpg
http://i.imgur.com/LHBYCkc.jpg
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05-27-2015, 02:16 AM #2
Hi,
When I look at the surface that was on the bed, you can see the individual strings.
It can be either of those things :
1/ you under extrude.
2/ your first layer height is not set correctly (too high -> not squished enough).
It is safe to rule out /1 because if it was under extrusion, you would see it on the rest of the print as well and it doesn't look to be that way.
So, you should check /2. I don't know the M3D firmware, but in reprap that would be a combination of M212, M500 and M501.
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05-29-2015, 11:03 AM #3
and the bed is probably not level.
With a printer without manual bed levelling - this could be a real sod.
The other thing - when printing without raft you need to oprint the first layer VERY slowly.
second set of pictures look absolutely fine.
What kind of finish were you expecting ?
The base of a printed object will reflect the surface it was printed on. As I understand it the micro uses a textured bed. So you'll get textured base to your prints.
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05-29-2015, 07:41 PM #4
- Join Date
- May 2015
- Posts
- 48
Also, I noticed that when I turn off the raft, my prints have a few hollow areas around edges. This appears to be the software doing it on purpose, instead of an uneven or mis-calibrated bed, as it's always the same edge even if I move the location of the model on the print bed before printing, and I saw it purposely not fill in those areas when printing the first layer.
http://i.imgur.com/Q4vu7nb.jpg
Sadly, I don't have some fine-tine settings in my firmware. I can manually send it g-code, but I can't define such settings in g-code before sending it a print job, unless I print the entire job from a gcode file.
I was expecting the bottom layer to look like the model that was printed vertically or on a raft, small thin lines that almost look solid, rather than the thick doodle-like lines. Do all printers print the bottom layer like that if you use no raft? This is my first one so I wouldn't know how others behave.
And I doubt it's the bed. Judging by that image I linked, the software seems to be doing it on purpose.
It's pointless to print this thing on a raft though, since the raft sticks ridiculously tightly to the printout. I just tried, and I could not get it to come off even with razor blades... and it was even less flat than the non-raft model, as the plastic appears to have filled in the cracks in the raft in very fine lines. This only seems to happen with models that have a large flat area against the bed, models with a smaller footprint don't really seem to have trouble coming off the raft.
Holes and pockmarks in print walls
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