Is that the Result of a to long isopropanol bath?


i got today a important telephone call with big problems, which made that i forgot 4 parts in the bath, so the bath time was approx 90-110 minutes…

when i put the parts out, i m not sure if the big cracks were there, but when i started to cut the support away, the support poped compledly away and also a lot of material…

is that the result of to much and to long bathing?
Or is something other worng?

this was my support or was this to less support?

I don’t think those imperfections have anything to do with IPA. Must be some flaw that was already there from the print.

About 10 days ago, I did a test print with the FormLabs butterflies using the ALW beige, and put the five butterflies into the IPA for cleaning. 2 days ago, when I was washing another print, I found one of the butterflies at the bottom of the IPA tank. It had been there for over a week.

I pulled it out and let it dry. The print was extremely flexible, almost rubber like, but in otherwise perfect condition. 2 days later, it’s still flexible, although not as much as before.

So, about the only thing that will happen to a print is it will absorb IPA and get soft, but eventually the IPA will evaporate leaving the model intact.

ok, than its really strange

and you also use 99% isopropanol?

i have alsway a problem with area where the support spring away and damage the file…

or is my iso bath to cold?!?

I use 91% IPA, I’ve never found 99% at any of the pharmacies around here. As for the temperature, it’s room temp, so about 75° F.

There’s no issue with 99% IPA.

The kind of defect you are seeing are usually due to the peeling forces being too big in relation to the mechanical strength of the resin before post-curing. Are you sure the parts were not like that out of the printer ?

IPA does tend to make the resins swell a bit when the parts have not been post-cured, and it is possible that the internal stress in the part due either to the geometry, the laser settings or the resin itself (probably a combination of these factors) were too big. Was the IPA really cold ?

No, this is due to insufficient supports, particularly near the very first support. You will want to manually add some supports. Also, tipping the model to a steeper angle is likely to help. Unfortunately, automatic support generation is not perfect and issues like this are things we are continuing to to improve.

i print today new, and also brock also, i think density of support is that factore…

which factor to you use, i increase now form 0,5 to 0,75 is it still to low?

but also strange with that white foam, it that normal with the grey resin?

I don’t know if anyone noticed this, but in one of the photos (below, you can see bridges forming across the supports on the bottom surface of the model.

That shouldn’t happen, there’s something wrong either with the peel process or with the optics. I don’t know about the foam why that happens either, but it shouldn’t be like this.

is that also the reason why i have so bad problems with the cleaning the support and that i always damage my part, and have to use putty to get it back?

the form 2 is only 1 month old.

It looks like your support tips in that case were right on the edge. Getting those off without chipping the edge can be tricky. I use a pair of diagonal flush cutters for this job.

do thing my form 2 ist damage?

I don’t know. What I know is that the supports are not supposed to start running sideways and bridging across the surface of the model.

Someone at FormLabs should take a look at those particular photos and see if they have an answer.

The last photo you posted shows a different issue (Actually not a real problem), so let’s first see if we can solve the first problem with the supports.

the frist problem is clear, 55% support was to less, with 75, it printed well…

put i see here so many parts, people directly take out of the printer and all is fine…

mine are always damage form support…

and thats a no go

50 is definitely too little density. I never print under 80 unless I really really have to and then I run a test print beforehand.

ok and which point size do you use?

because of that spring away of material, i thought better go to 0.6 in size…
or is bigger better?

The default settings are the best starting point but then you’re not using Formblab’s resins so I don’t know. If your resin is similar to the Standard resins from Formlabs then I’d say .6 is safe.

Bigger is better since it’ll adhere much better to the part and you don’t want your part to separate from the supports during the peeling operation. Downside is that obviously your part will have more visible marks with bigger support points.


i never said that i using NOT form resin…
that the expesion grey form resin i m using

It must be the white balance of your camera then, the resin looks much more beige than FL’s Grey resin on your photo which is why I was assuming you were using a third party.

Before doing anything the first thing I would do is open up a support ticket. While you are waiting to hear back from them, check the bottom of the tank to see if there are any fingerprints or smudges. After that check the optical glass and clean if necessary and finally check the mirrors. I also filter my resin after every print to make sure I get all the under-cured resin out of the tank as well as any other contaminants that might be in there.


ok but i use original fromlabs grey v4 flgpgr04

and i really not happy with that printer for that price, when cleaning is so bad and everytime material spring away…