Bubbles? MB2X

[Neil McElravy]

     I have been getting bubbles on my raft, & it is proving to be quit hard to print something like a house that covers a large surface of the build plat? The corners just fold up. I'm printing in the neighborhood of layers .11 mm, 2 shells, extruder 230c, plat heat is at 125c in ABS. I'm new to this and would like any advice you might have. Thanks for your time, & have a great day fellow Makers!

Neil Mc

[Jetguy]

Well, it's kind of a known issue the 2X has non-flat bed issues.
Common sense says if the bed isn't flat, huge parts aren't going to
print well and curling would cartainly be a symtom.

All I can say is print on glass+ hairspray if you intend to build
objects that large.
The otehr new upcoming option is to replace the stock bed with one
Bottleworks is working on.

Again, the problem is the bed, pretty easy to see that during a level
check. Glas is dead flat and therefore once leveled would be the ideal
solution.

On May 26, 10:40 am, Neil McElravy <extraordinary7...@yahoo.com>
wrote:

>  DSCN1824 (800x600).jpg
> 47KViewDownload

[Joseph Chiu]

At a quick glance, it feels to me like your raft is getting spread out far more than I would expect to see with a proper raft.  That may be causing some of the plastic to buckle upwards.

You might try increasing the gap between the nozzle and the bed, or by dialing down the flow rate for the raft.  For Sailfish-enhanced machines, you can just change the Z-offset manually (increase it by about 0.05 mm) - not sure about stock.

On Sun, May 26, 2013 at 7:40 AM, Neil McElravy <extraord...@yahoo.com> wrote:

     I have been getting bubbles on my raft, & it is proving to be quit hard to print something like a house that covers a large surface of the build plat? The corners just fold up. I'm printing in the neighborhood of layers .11 mm, 2 shells, extruder 230c, plat heat is at 125c in ABS. I'm new to this and would like any advice you might have. Thanks for your time, & have a great day fellow Makers!

Neil Mc

--
You received this message because you are subscribed to the Google Groups "MakerBot Operators" group.
To unsubscribe from this group and stop receiving emails from it, send an email to makerbot+u...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
 
 

[Jetguy]

Also, let's go further here. It's a 2X so in theory, it can print both
PLA or ABS. The problem is some folks are having issues printing in
PLA. ABS is known to be problematic with curling and shrinkage in
large parts, especially bed filling ones like what you are trying to
print.

I'm just being honest but on a 2X, you have some problems to overcome.
Between the stock bed, the problems people are reporting with PLA and
just the fact you are building large objects that fill the bed, I
expect that you will be lucky to have success. Further, you said you
are printing with raft. I doubt raft is going to help the situation.
With ABS and the shear size, the lack of contact will curl up for
sure. PLA is the better plastic but elswhere I pointed out why people
are having issues because the 2X has some radical thermal changes
compared to previous printers. Simply put, PLA is temperature
sensitive in the filament drive/feed area and the new thermal barrier
tube mounting causes higher temps in the area. The fact the bot is
enclosed further can hold in the heat.

Hopefully some 2X owners come up with some ideas or suggestions.

On May 26, 12:00 pm, Joseph Chiu <joec...@joechiu.com> wrote:
> At a quick glance, it feels to me like your raft is getting spread out far
> more than I would expect to see with a proper raft.  That may be causing
> some of the plastic to buckle upwards.
>
> You might try increasing the gap between the nozzle and the bed, or by
> dialing down the flow rate for the raft.  For Sailfish-enhanced machines,
> you can just change the Z-offset manually (increase it by about 0.05 mm) -
> not sure about stock.
>
> On Sun, May 26, 2013 at 7:40 AM, Neil McElravy

> <extraordinary7...@yahoo.com>wrote:

[Jetguy]

In fact, the more I look at the picture, the bubbles are the least of
your problem. You had a full on extruder failure to feed on the
second layer. You can see the thin strips where the extruder was
barely extruding anything at all. If that's PLA, then you just
experienced the failure from heat I have been saying will happen. The
best fix I could tell you to try is get a fan blowing on the extruder
while printing.You need to cool the area where the filament enters the
hot end.