PEI print bed surface experiments

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davec3275
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Re: PEI print bed surface experiments

Postby davec3275 » Sat Feb 27, 2016 11:04 am

Has anyone who bought a sheet of PEI from Amazon had it not be a true 12"x12"? I have had mine for about a month now and just found the time to install it on my build plate. Well, as you can see from the picture it is not big enough to cover the entire build plate. Is it worth trying to make it fit, maybe center it so the clips are where there is no PEI?

This is the same one that was linked in the PEI thread (viewtopic.php?f=36&t=7452).

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Re: PEI print bed surface experiments

Postby mhackney » Sat Feb 27, 2016 11:51 am

The size is nominal 12x12 but that is quite a bit undersized. I'd get it replaced. If you can live with it, centering it s a good idea.

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Re: PEI print bed surface experiments

Postby davec3275 » Sat Feb 27, 2016 12:11 pm

mhackney wrote:The size is nominal 12x12 but that is quite a bit undersized. I'd get it replaced. If you can live with it, centering it s a good idea.


I looked into replacing it and unfortunately I missed the return window by 2 days. Tempted to order another, but worried it won't fit either. I saw some reviews on Amazon and some have had issues with sizes not being as advertised. I would rather it fit exactly.

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Re: PEI print bed surface experiments

Postby Eaglezsoar » Sat Feb 27, 2016 1:09 pm

davec3275 wrote:
mhackney wrote:The size is nominal 12x12 but that is quite a bit undersized. I'd get it replaced. If you can live with it, centering it s a good idea.


I looked into replacing it and unfortunately I missed the return window by 2 days. Tempted to order another, but worried it won't fit either. I saw some reviews on Amazon and some have had issues with sizes not being as advertised. I would rather it fit exactly.



I would not accept it the way it is, too bad you missed the return window.
McMasterCarr sells the PEI as well as others. Google will find them. They are more expensive than Amazon but now you know why Amazon is cheaper.
Edit: After checking McMaster Carr and some other sites, the cut tolerances can be 1" off in any direction. I think we need input from other users to find the best
source for PEI that are cut very close to the advertised dimensions.
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Re: PEI print bed surface experiments

Postby Xenocrates » Sat Feb 27, 2016 2:45 pm

Also, another thing. The Max has a 310MM bed. That's 12.25 IN. You not only don't want to be undersized, you want over size, which most sellers are more loath to do (It happens sometimes, but most would prefer to err under). I bought a chunk from McMaster Carr, and it was 12 precisely, by 24.25. A little over, but on the wrong dimension for what I really wanted (I bought 2 beds worth, to have one as close to perfect as possible, and a backup). But if you have an enclosure, which you really want for large parts, you can't get that close to the edge most of the time, and the Max's Kinematics aren't very accurate on the extreme edges of the bed. (Which is unfortunate, but accounted for in the advertised bed size). If you go out to the edges perfectly, you actually get more than you paid for, both from the printer, and the PEI supplier.
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Re: PEI print bed surface experiments

Postby mhackney » Sat Feb 27, 2016 4:33 pm

The problem is that it will vary from batch to batch. I've ordered at least 15 sheets from Amazon and they have all been just right for the borosilicate glass diameter. I've also bought 4 sheets from McMaster and they were fine too. I don't recall seeing a +/- 1" tolerance, that is really not acceptable for this material.

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Re: PEI print bed surface experiments

Postby Eaglezsoar » Mon Feb 29, 2016 4:00 pm

mhackney wrote:The problem is that it will vary from batch to batch. I've ordered at least 15 sheets from Amazon and they have all been just right for the borosilicate glass diameter. I've also bought 4 sheets from McMaster and they were fine too. I don't recall seeing a +/- 1" tolerance, that is really not acceptable for this material.


This link to McMaster Carr shows a 1" tolerance on their sheets unless my moldy oldy eyes have done it to me again. :) :)
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Re: PEI print bed surface experiments

Postby KAS » Mon Feb 29, 2016 8:10 pm

I'm on my second sheet in six months, both don't fit the glass fully (amazon .040)

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Re: PEI print bed surface experiments

Postby ccavanaugh » Tue Mar 01, 2016 5:10 am

KAS wrote:I'm on my second sheet in six months, both don't fit the glass fully (amazon .040)


4 sheets from amazon also that won't fit either.

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Re: PEI print bed surface experiments

Postby davec3275 » Tue Mar 01, 2016 11:48 am

ccavanaugh wrote:
KAS wrote:I'm on my second sheet in six months, both don't fit the glass fully (amazon .040)


4 sheets from amazon also that won't fit either.


I ordered a 12"x24" sheet from Amazon yesterday. Here's hoping the 12" direction fits.

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Re: PEI print bed surface experiments

Postby davec3275 » Wed Mar 02, 2016 7:59 pm

Okay, so the new sheet arrived today and surprise surprise, the 12" direction does not fit. In fact, it is 1/4" shorter in BOTH directions. I REALLY want it to cover the entire glass plate, so back it goes.

If anyone has any sources that they have had WAY better success with, please let me know.

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Re: PEI print bed surface experiments

Postby JFettig » Wed Mar 02, 2016 8:28 pm

You really don't need to cover 100% of it. Your plate is actually larger than 12" anyway, closer to 12.25"

You also can't print all the way to the edges either. Yes it would be nice but its not completely necessary.

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Re: PEI print bed surface experiments

Postby SEBRET » Sat Mar 05, 2016 12:31 am

JFettig wrote:You really don't need to cover 100% of it. Your plate is actually larger than 12" anyway, closer to 12.25"

You also can't print all the way to the edges either. Yes it would be nice but its not completely necessary.



Agreed. I centered mine and just lift the four lips uncovered. doesn't affect prints and the clips still work fine

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Re: PEI print bed surface experiments

Postby ccavanaugh » Sun Apr 03, 2016 7:26 am

I've been using PEI for awhile now... awsome stuff.

My question is autocalibrating with FSRs while the hot end is at 250C.

250C is above the glass transition temperature of the material. The touch is very brief, but I didn't know if anyone had long term experience with the effects of probing the surface while hot.

I can set gcode to probe first at a lower temperature which is better than nothing, but would prefer to probe at full temperature.

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Re: PEI print bed surface experiments

Postby mhackney » Sun Apr 03, 2016 5:32 pm

I haven't had any problems at 250° C probing and I've done quite a bit of it. Like you said, the touch is instantaneous so I think that prevents any issues.

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Re: PEI print bed surface experiments

Postby ccavanaugh » Sun Apr 03, 2016 8:53 pm

mhackney wrote:I haven't had any problems at 250° C probing and I've done quite a bit of it. Like you said, the touch is instantaneous so I think that prevents any issues.


Thanks, much appreciated!

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Re: PEI print bed surface experiments

Postby bwaslo » Fri Oct 20, 2017 12:42 pm

Sorry to revive an old thread, but I noticed here someone had suggested that JBWeld might be usable for attaching PEI to glass. I've had my 'fun' issues with the 3M adhesive sheets, and saw how silicone adhesive looked good at first but then detached after a few weeks. Thinking perhaps if I squeegeed JBWeld part "A" onto the glass and part "B" onto the PEI, then squeezed them together and let them sit for a few days....? But rather than waste a sheet of PEI, it would be best to check here to see if anyone had already tried that.

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Re: PEI print bed surface experiments

Postby geneb » Sun Oct 22, 2017 9:23 am

If someone has suggested using JBWeld, they're either nuts or pulling your leg. :)

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Re: PEI print bed surface experiments

Postby DeltaCon » Mon Oct 23, 2017 4:31 am

Looking at the specifications (and safety warnings!) of this JBWeld product, it would make sense for it to be working great for glueing PEI. However I think I remember more people having tried it. It seems to loosen over time. The 3M glue sheets work fine, just apply dry. Because the glass and the PEI do not breathe air, the glue never dries completely being caught in between. The easiest way is to lay the glue liner flat on a table, have some extra hands to pull it straight, and smash the glass (or alu sheet) to it in one straight movement. Afterwards apply the PEI sheet from edge to edge in one rolling movement.
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Re: PEI print bed surface experiments

Postby geneb » Mon Oct 23, 2017 8:55 am

I used Windex and floated the adhesive on to the pei, and once it dried I used the same technique to attach the glass plate.

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