PEI print bed surface experiments

teoman · Post by **teoman** » Thu Aug 07, 2014 1:55 pm

Yes bubbles will be a problem and I will try to be carefull.

I have has success coating iphone and ipad screens. Hope to use the same techniques.

How about glass - tape -aluminum foil -tape - pei?

nitewatchman · Post by **nitewatchman** » Thu Aug 07, 2014 2:06 pm

teoman wrote:How about glass - tape -aluminum foil -tape - pei?

No experience.

I used Copper plate between the bed and the glass. Spreads the heat nicely and after stablizing, it stores an amazing amount of heat.

teoman · Post by **teoman** » Thu Aug 07, 2014 4:17 pm

Can taht be bought pre cut?

nitewatchman · Post by **nitewatchman** » Thu Aug 07, 2014 4:46 pm

Mine came 12" x 12" square and I cut it on a Scroll Saw. It could also be cut with a manual Coping Saw, it would just take longer and give you Popeye the Sailor Arms.

teoman · Post by **teoman** » Fri Aug 08, 2014 6:26 pm

Thanks order placed.

Renha · Post by **Renha** » Sat Aug 09, 2014 3:14 am

I have tried my PEI first time. Bad experience with 70⁰ C, very good with 90⁰ C. Maybe I will try 80, 90 is sooo long to wait

mhackney · Post by **mhackney** » Sat Aug 09, 2014 8:02 am

That must be with ABS? I run 75-80° with ABS. A quick swipe of the surface with alcohol and using the ultra ultra fine sandpaper technique I described earlier in this thread will do wonders.

teoman · Post by **teoman** » Sat Aug 09, 2014 9:52 am

From what I read one side is smooth and the other mildly textured.

Would the textured side be like pre-sanded?

mhackney · Post by **mhackney** » Sat Aug 09, 2014 4:01 pm

No, I use the matte side because I like the look it gives the parts. But I do lightly sand it every 10 prints or so too.

teoman · Post by **teoman** » Sun Aug 10, 2014 4:28 am

Thanks a lot. What grit sandpaper?

mhackney · Post by **mhackney** » Sun Aug 10, 2014 9:30 am

I'm going to give you the direct answer but first I'm going to show you how to find it quickly yourself!

As I mentioned a few posts up I described earlier in this thread. So, see that "Search this topic..." box in the upper left under the SeeMeCNC logo? Enter "sandpaper" and click the Search button. It will find all the posts in this thread that contain the word sandpaper. In this case it points to a handful, one of which is: http://forum.seemecnc.com/viewtopic.php ... per#p36006

Where I describe the technique using 1500 grit sandpaper - don't use anything courser or you will ruin the PEI. Note also that I do this dry and then wipe with an alcohol wipe.

NOTE: It is so much faster to do a quick search in a thread or even on the site search box (the magnifying glass at the upper right of the screen) than creating a "what's the answer" post. I always do this once or twice and then if I can't find something I know I've seen here, I'll ask and say I searched but couldn't find it.

cheers,
Michael

teoman · Post by **teoman** » Sun Aug 10, 2014 5:14 pm

Sorry abut that. I did read the entire thread but must have missed it. And I am on a mobile now so UI is not the most convenient.

Thank you for the answer and the time to respond.

mhackney · Post by **mhackney** » Sun Aug 10, 2014 5:15 pm

Ah yes, doing things on a mobile device is a bit of a pain!

cheers,
Michael

Renha · Post by **Renha** » Mon Aug 11, 2014 3:57 am

mhackney wrote:That must be with ABS? I run 75-80° with ABS. A quick swipe of the surface with alcohol and using the ultra ultra fine sandpaper technique I described earlier in this thread will do wonders.

yes, that was ABS, sorry for forgetting to mention that. But the history has been continued, on bigger prints i have no success even with 90 grades Celsius: http://forum.seemecnc.com/viewtopic.php?f=62&t=6072. I will try sanding

teoman · Post by **teoman** » Thu Aug 21, 2014 5:37 pm

Rhena, are you having any success with the PEI.

Also, from reading this thread, the PEI is slow to heat up. So, i would/will manually heat the bed to desired themperature and then leave it there for 10 minutes so the heat reaches the top side. Then start the print...

mhackney · Post by **mhackney** » Thu Aug 21, 2014 9:09 pm

My heated bed heats to 60°C in 50 seconds with an aluminum (1/8") dissipator, borosilicate glass and the PEI. I use a 24v power supply on an SSR. Can't beat that. 80°C takes about 70 seconds. I do *usually* let it equilibrate for a few minutes but I've also printed many, many parts as soon as the thermistor says it hits 60°C.

cheers,
Michael

Renha · Post by **Renha** » Mon Aug 25, 2014 2:33 am

teoman wrote:Rhena, are you having any success with the PEI.

Haven't tried: 24V heater cartridges has come, and i am working on connecting 24V 600W power supply to Azteeg X3 Pro. One wire's insulation already has been melted as a result

teoman · Post by **teoman** » Mon Aug 25, 2014 4:46 am

My 12x12 tape has arrived. Now I am waiting for my pei.

I hope it is not undersized.

critical_limit · Post by **critical_limit** » Mon Aug 25, 2014 2:10 pm

teoman wrote:My 12x12 tape has arrived. Now I am waiting for my pei.

I hope it is not undersized.

Ordered my Tape and PEI around 3 weeks ago. Nothing shipped yet. Did you ordered your tape and PEI at amazon?

Thats what I ordered:

http://www.amazon.com/gp/product/B007Y7 ... UTF8&psc=1

http://www.amazon.com/gp/product/B0013H ... UTF8&psc=1

http://www.amazon.com/gp/product/B0013H ... UTF8&psc=1

Do you Guys have another place for these things to order? Can´t wait soooo loooooong to test it

teoman · Post by **teoman** » Mon Aug 25, 2014 2:49 pm

First 2 are what I ordered.

I got the tape (and a noctua fan that i ordered). They were massively over packed. Could have fit 6 laptops in there. But the PEI is sill nowhere to be seen.

PS. I live in Istanbul. So it would take longer to reach me than you.

critical_limit · Post by **critical_limit** » Mon Aug 25, 2014 4:27 pm

teoman wrote:First 2 are what I ordered.

PS. I live in Istanbul. So it would take longer to reach me than you.

I´m in Berlin, Germany. Think we have to wait for a few more weeks

teoman · Post by **teoman** » Mon Aug 25, 2014 4:39 pm

As long it arrives...

I am really having trouble with bed adhesion... pritt doesnt really work well. Hairspray usually lets go after 5 or 6 layers. So far only abs juice seems to work. But that is such a mess.

For shnazzy parts it is ok as I can just pour on some more on the existing layer. But if I want a clean print then the bed has to be cleaned and abs juice applied again very cleanly and all that is very time consuming.

I have high hopes for the PEI.

Renha · Post by **Renha** » Tue Aug 26, 2014 1:58 am

I have tried my PEI (without sanding yet) with 120 grade Celsius heated bed (with 24v power supply it's faster than getting 85 grade with stock one!) with small parts - adhesion is Great, but first 20-40 layers of part is little overmelted, and now I think that I am really need heat spreader plate: I could touch heated plate without pain near to it's border.

nitewatchman · Post by **nitewatchman** » Tue Aug 26, 2014 10:36 am

I think that 120C is perhaps a little high and heat spreader plates really help make the bed temperature uniform. I use 65C for PLA and 105C for ABS. I think that you want to be near or at the Glass Transition Temperature (65C for PLA and 105C for ABS).

Many people use aluminum, I used copper due to it much higher heat transfer coefficient and ability to store heat but it cost 6x more ($50USD verses $8USD).

nitewatchman

Renha · Post by **Renha** » Tue Aug 26, 2014 11:40 am

I am in search of copper plates supplier near to me for at least 6 hours. What width do you use? For now I am searching 10mm one, is it o'k?

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PEI print bed surface experiments

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