PMMA sheet as print bed

Post improvements made for UP, and share ideas.
pleppik
Posts: 336
Joined: Sun Dec 11, 2011 2:14 pm

Re: PMMA sheet as print bed

Post by pleppik » Sat Nov 16, 2013 8:22 pm

ktronik wrote:how close is PMMA to Lexan??
Lexan is the brand name for polycarbonate, and is a different material.

I tested both acrylic and polycarbonate and found that with a heated bed the polycarbonate is much better. Acrylic starts to soften and warp below 100C, so for printing with a 100C heated bed the acrylic was good for one print. Polycarbonate can take a lot more heat, and is good for hundreds of prints.

Adhesion with both polycarbonate and acrylic is very good. Releasing the print can be a problem.

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josejuako
Posts: 479
Joined: Fri Aug 20, 2010 5:55 am

Re: PMMA sheet as print bed

Post by josejuako » Sat Nov 16, 2013 10:06 pm

Lexan is the General Electric mark from the polycarbonate pleepik .


J

Jena67
Posts: 50
Joined: Sat Dec 10, 2011 9:28 am

Re: PMMA sheet as print bed

Post by Jena67 » Sat Nov 16, 2013 11:10 pm

I think lexan is PC, polycarbonate, Pmma is polymetylmetacrilate. Noto really dure how you spell it! :)

roller
Posts: 1622
Joined: Sat Oct 06, 2012 9:09 pm
Location: Brisbane, Australia

Re: PMMA sheet as print bed

Post by roller » Sat Nov 16, 2013 11:14 pm

Polymethyl methacrylate ... so you were close

ktronik
Posts: 96
Joined: Thu Apr 25, 2013 4:52 am

Re: PMMA sheet as print bed

Post by ktronik » Sun Nov 17, 2013 2:04 am

so does the PMMA board really work cold?? this is the main question in my mind...

Jena67
Posts: 50
Joined: Sat Dec 10, 2011 9:28 am

Re: PMMA sheet as print bed

Post by Jena67 » Sun Nov 17, 2013 9:08 am

I have completely disconnected the heater of the board.


I'll show you a picture while printing...

the great about it is that you can print right away after turning the printer on...

Here is a picture of the metallic wire.
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Jena67
Posts: 50
Joined: Sat Dec 10, 2011 9:28 am

Re: PMMA sheet as print bed

Post by Jena67 » Sun Nov 17, 2013 12:05 pm

HI,

here are two pictures, you can see I'km printing a pretty big structure with -0.1°C bed temperature.

Ciao
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Jena67
Posts: 50
Joined: Sat Dec 10, 2011 9:28 am

Re: PMMA sheet as print bed

Post by Jena67 » Sun Nov 17, 2013 2:23 pm

Here is the finished print.

The PMMA bed works really great even if it bends a little

The ABS wire is also pretty cool.

I'll try to use acetone to see how the effect will be.

0.15mm resolution would definitively help!
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In use!
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You can appreciate a little base bending
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IMG_20131117_150721.jpg
Print ready, the biggest I did so far. 0.4mm fast print
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ktronik
Posts: 96
Joined: Thu Apr 25, 2013 4:52 am

Re: PMMA sheet as print bed

Post by ktronik » Sun Nov 17, 2013 9:34 pm

Thx for the update!!

base bending is GOOD, its shows its sticking...

OK, I want in, how do I get a board from you?? Please PM me with details ect...

thx again

Kerry

Jena67
Posts: 50
Joined: Sat Dec 10, 2011 9:28 am

Re: PMMA sheet as print bed

Post by Jena67 » Tue Nov 19, 2013 2:11 pm

Hi,

I've found the right compound for the filament.

Please see the attached pictures and let me know your comments freely.

If you're interested send me a PM, I can ship anywhere in the world.
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3-Raft removed from PMMA bed.JPG
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2-Cleaned.JPG
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1-Finished.jpg
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Jena67
Posts: 50
Joined: Sat Dec 10, 2011 9:28 am

Re: PMMA sheet as print bed

Post by Jena67 » Tue Nov 19, 2013 2:13 pm

I can't add more than 3 pictures at a time...
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5-Extended.JPG
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4-Raft removed from part.JPG
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Jena67
Posts: 50
Joined: Sat Dec 10, 2011 9:28 am

Re: PMMA sheet as print bed

Post by Jena67 » Tue Nov 19, 2013 2:14 pm

Here is the last one
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Jena67
Posts: 50
Joined: Sat Dec 10, 2011 9:28 am

Re: PMMA sheet as print bed

Post by Jena67 » Tue Nov 19, 2013 2:18 pm

Here is the silver printed @ 0.15mm
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0.15mm silver.JPG
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wayneuroda
Posts: 1
Joined: Thu Nov 21, 2013 1:23 am

Re: PMMA sheet as print bed

Post by wayneuroda » Fri Nov 22, 2013 12:52 pm

Hi,

Can you tell me, is there a trick to printing without the bed heater? If you unplug the heater will the UP printer begin printing when the nozzle gets to temperature (or will it wait forever for the platform to get to temperature?)

Thanks!

Jena67
Posts: 50
Joined: Sat Dec 10, 2011 9:28 am

Re: PMMA sheet as print bed

Post by Jena67 » Sat Nov 23, 2013 9:26 am

I have disconnected the plug that is in the board holder arm.

My UP is the first version, I'm not sure how is made in the next versions.

mr6k
Posts: 327
Joined: Tue Feb 14, 2012 11:47 am

Re: PMMA sheet as print bed

Post by mr6k » Sat Nov 23, 2013 10:28 am

Wayneuroda,

The platform heater on the up plus is just thermostatically controlled to a 100c set point. The software displays it but does not hold back printing regardless of the actual temperature. It is only the extruder temp that is monitored and prevents printing until it hits the desired temperature
cheers


Peter

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