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It doesn't look damaged. Just dirty of cured resin

I accidentally damaged mine when removing a failed print that was stuck to the FEP. I didn't poke a hole through it, so I'm still using it. It's not affecting prints much.

Use the plastic spatula to gently remove it

You sure it’s not dried resin

Geren W Mortensen Jr you can use it unit you've a puncture

Lorenzo Di Sante it is a bit damaged it’s all bumpy/crinkly (like it’s been heat up) (not saying it is)

Right. The only effect it has, in my case, is a very slight deformation on flat surfaces that are parallel to the FEP.

Matthew Street are you sure you removed all the stuck resin? Doesn't seem from images

Richard Hale yeah I’ve clean out the tank and tried getting it off it’s not coming off and it’s like the Feps melted

Geren W Mortensen Jr exactly, if you're printing 100% flat surfaces you need a 100% clean fep. But after few hours printing the fep deforms by itself. Luckily I basically never print flat stuff and when I do I can sand a little the surface

Matthew Street did you use alchol? It helps to detach cured resin

Matthew Street I'm pretty sure fep can't melt easily ? if you didn't heat it it's impossible

Sorry for bad video

Lorenzo Di Sante

The one flat item I print regularly is a lid for an electronic project box for a product I sell. I've found that, even with the wrinkle in the FEP, the "finish" side, which I print right on the build plate, is perfectly smooth. The wrinkle appears, very slightly, on the back.

Lorenzo Di Sante yeah I used alcohol but sorry maybe didn’t word it right I meant it’s like it’s been melted ?

Matthew Street okay it's like melted. You're right. This is very weird

Geren W Mortensen Jr I’ll give it a go later and see if it affects anything

Matthew did you changed it recently? You sure the tension was good?

Maybe it was too tensioned and it went into breaking point

Lorenzo Di Sante Nah I haven’t changed it I’ve had it ( the print for about a month) I haven’t done many prints still new to it trying to figure it out (I have had a bunch of failed prints

Matthew Street and when this thing happened was after a failed printing?

Lorenzo Di Sante yeah

Lorenzo Di Sante I tried a print it failed (got annoyed) left it a few days (resin still in tank) cleaned out the failed print and started a new one

Matthew Street and you noticed it after starting the new print?

Lorenzo Di Sante after I started the new one it finished after a few hours seen that a few things succeeded (multiple objects on print bed) I decided to completely empty my tank and clean it out then I noticed it

Well there’s no “slicing error” that can damage your fep, so most times failed bits or print, or poor removal of failed prints will result in damage

Matthew Street do you preheat your resin with heatgun or other similar water?

Scott Pavlich I count be that (poor removal I might of used to much force)

Lorenzo Di Sante nope I just pour it into the tank and go

Matthew Street ? maybe you didn't completely clean your vat when the print failed and when you stared a new one some hardened resin damaged your fep under pressure. Now you can only change it though

I had the same thing happen after about three weeks of printing.

Lorenzo Di Sante yeah that could be it (sounds logical) but Scott also makes a good point I may if used to much force when trying to clean it off

Well I’ve just ordered some more FEP sheets I’ll use the other side for now (it’s only on side) and I’ll use that sheet for practicing my prints

Matthew Street i hope it doesn't give you a hole! Tape the edges of your screen with kapton tape

Like I did here

Lorenzo Di Sante thank you so much for you ideas and suggestions (so do I need to do a full clean out if a print fails then (or is there a better or easier way to get the failed bits out ?

Lorenzo Di Sante is that to stop any leakages from going into the lcd ?

Lorenzo Di Sante and that’s a really good idea

Matthew Street you've to filter your resin back in the bottle, pour some alcohol in the vat after some minutes you can peel of the failed layers with the plastic spatula, then dry with a towel and you can pour back the resin

Matthew Street exactly. So I'm always sure it won't go inside the screen and onto the UV lamps

Lorenzo Di Sante ah ok so I need to do a full clean ?

Matthew Street exactly, your fep and screen will last longer

Matthew Street Place a piece of tape on the underside of the vat as well, right on the fep....done it a few times to prevent catastrophe

You cant damage only one side of the fep. It's so thin any damage to one side will damage the other. It's like saying you only have a hole on one side of a piece of paper.
Can you describe the actual damage, it's hard to make out from the pic. It almost looks like there is protective film that had lifted from the fep.

Robert James yeah true and I understand the pictures ain’t the best but I’m not fully sure how to explain it the only way I can think about it is if you got a thin piece of plastic that had been melted (way you used a heat gun on a plastic bottle)

looks like cured resin on the fep to me.

Warm the fep with a hair drier and the majority of the damage should dissapear

James Forder cool I’ll give that a try tonight