[Design and Technology] Fwd: [esnet] Cold and warping issues on the UP!, print speed

[Scott Phillips]

What I've found with the schools that I teach at is that the simplest
solution to this is to throw a large clear plastic storage container over
the top of the UP Plus to avoid drafts and to keep the heated bed at the
correct temperature.

Acrylonitrile Butadiene Styrene (ABS plastic) shrinks as it cools.  This
causes two issues.  Firstly, excessive shrinking as the plastic comes into
contact with the bed can cause the print to not stick.  If the print
delaminates then it's all over, Rover, and if unattended will result in a
"bird's nest" of extruded filament.  Secondly, excessive shrinking in later
layers can cause the print to "boat" or curl upwards towards the print
head.  This causes deformation in the print and also causes subsequent
layers to get squashed.  If your object was oriented with a flat base at
the bottom then your base is not going to be flat.

The heated bed in the UP Plus is quite good though.  I've used machines
where the bed doesn't have enough power to keep the required temperature
and that can be a problem, and one of my schools has a machine with a
non-heated bed, which is next to useless.  It restricts you to using PLA
(PolyLactic Acid) which can be somewhat difficult to print with.  For
affordability and performance, ABS is the way to go.


Scott Phillips
scott at the-robots-are-coming.com
0417 592299
 <http://www.the-robots-are-coming.com>




On 7 June 2014 10:54, David Fletcher <dgfletch at bigpond.net.au> wrote:

>
>
> Sent from my iPad
> David Fletcher
>
>
> Begin forwarded message:
>
> *From:* "Tony Pugatschew" <support at intellecta.net>
> *Date:* 7 June 2014 10:44:22 AM AEST
> *To:* "ESNET @ iiate" <esnet at iiate.asn.au>
> *Subject:* *[esnet] Cold and warping issues on the UP!, print speed*
> *Reply-To:* "ESNET @ iiate" <esnet at iiate.asn.au>
>
> Dear All,
>
> Getting a flood of calls re the UP! warping issues. Seems to be related to
> the onset of winter.
>
> Here are some suggestions that hopefully can help.
>
> a)      Make sure the bed is flat. If you are having warping on a corner
> then the bed is not flat.
>
> b)      Keep it warm – hard to do on the UP! Plus but easy on the UP!
> Mini ( enclosed)
>
> c)       Check the print plate – could be dusty.
>
> d)      Level position – I adjust the height until I feel a “grab” on a
> piece of 80gsm paper.
>
> e)      Examine the print bed PCB.
>
> f)       Check orientation of part – try to keep the thicker parts as
> vertical walls and minimise the base thickness.
>
> I have had great success with a 3mm grey tile material. Cut with an angle
> grinder fitted with diamond blade.
>
> I spray with the clear spray – Little squirts from Bunno’s. Sticks really
> well and needs a chisel to remove.
>
> In fact, the print sticks so well that an infrequent expletive seems to
> assist – do this away from earshot of students.!
>
>
>
>
>
> Had questions on print speed.
>
> If you are having trouble getting through a design because of time then
> examine the design. Additive printing is slow and this often left out of
> the seductive spin marketing hype. I have only seen the time mentioned
> twice in articles – kayak took 45 days and the car body took 13 months to
> print. Get the students to appreciate the layer thickness. Is it necessary
> to print at 0.2mm layer thickness when 0.4mm is fine and a lick with
> acetone will smooth the surface?. The higher accuracy is important if you
> have small angled features.
>
>
>
> Solution in a school is simple – get more Printers!! . The baby up minis
> $650 ex GST and you can get a couple. These have proved to be most reliable
> and have survived a drop down some stairs. We can help with these but the
> waiting time is about 4 weeks!!!
>
>
>
> The other suggestion on print adherence is to gently push up on the first
> layer print so the raft really beds down. You can remove the pressure after
> the first layer.
>
>
>
> Hope this info helps and happy printing!
>
>
>
>
>
> Tony Pugatschew
>
> 08 8351 8288
>
> Local mobile: 0419 801 392
>
> Email: support at intellecta.net
>
>
>
>
>
>
>
> _______________________________________________
> esnet mailing list
> esnet at iiate.asn.au
> http://mail.iiate.asn.au/mailman/listinfo/esnet_iiate.asn.au
>
>
> _______________________________________________
> http://www.edulists.com.au - FAQ, resources, subscribe, unsubscribe
> Design and Technology Mailing List kindly supported by
> http://www.vcaa.vic.edu.au/vce/studies/designtech/destechindex.html  -
> Victorian Curriculum and Assessment Authority and
> DATTA Vic - Design and Technology Teachers' Association of Victoria
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.edulists.com.au/pipermail/destech/attachments/20140608/ee8bf41f/attachment-0001.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.jpg
Type: image/jpeg
Size: 15297 bytes
Desc: not available
Url : http://www.edulists.com.au/pipermail/destech/attachments/20140608/ee8bf41f/image002-0001.jpg