Hello, since I worked with a Form3 for years but have now switched to a Form4, I was wondering if I can continue to use my Tough2000 V1 from the Form3 on the Form4 if I fill it into the Form4 cartridge? But there are two different versions, Tough2000 V1 (Form3) and Tough2000 V1.1 (Form4)? I was also wondering if the Grey Pro is not yet available for the Form4? I don’t think the Grey V5 has the same features as the Grey Pro, does it?
Today I received the following answer from support regarding the question of whether the Tough2000 V1 can also be printed with the Form 4:
„The resin for the two generations has a different formula and therefore unfortunately cannot be used with the current printers. The Form 3 resins are even thicker than those for the Form 4. Furthermore, the cartridges are blocked after about 1.5 liters of resin have been used so that we can prevent third-party products from being used with the printer.“
I wish they would have kept Tough 2000 v1 for the form 4 printers… the new Tough 2000 v1.1 is more brittle than the v1 formula
They say, that it has become thinner for the Form 4 because of the printing speed. I guess that’s just a given!
we have some production parts that have to go through UL Impact testing…they pass with the v1 resin formula, but fail (split or bust) with the new v1.1 formula
Hey @charger_01,
You are correct that they are different formulas. The Tough 2000 V1 formula was slightly updated to V1.1 to be optimized for, and take advantage of the Form 4 print engine. Grey Pro will not be available for Form 4, the new Grey Resin V5 replaces both Grey Resin V4 and Grey Pro. Grey Resin V5’s mechanical properties outperforms those of the previously premium Grey Pro option, and is more affordable than both, which our materials team is very proud of.
Hello, I can imagine that, a positive property always leads to a negative one! Either it is tough and stable, but cannot be processed quickly, or vice versa. Since I use it for slot car bodies, I hope that the properties are not too brittle. Unfortunately I don’t have an open source license and am therefore dependent on Formlabs material, unfortunately!
Hi @Lantech50 and @charger_01,
Just to clarify, the changes between Tough 2000 V1 and V1.1 are minimal. The core polymer itself has not changed, and the mechanical properties remain the same. The updates in V1.1 were made purely to adjust how the material absorbs and reacts to light so it could work better with the Form 4’s print engine, but it wasn’t made thinner or more brittle.
If you’re seeing differences in part performance, there may be another factor at play, whether it’s print settings, post-processing, or something else. I’ve also personally printed a lot with Tough 2000 V1 on Form 4 and recently switched to V1.1, and have not noticed any change in brittleness tradeoffs.
That’s great to hear! So did you print the Tough2000 V1 on the Form 4? How did you solve the cartridge issue? Formlabs Support told me that the cartridge measures the weight and shuts off the resin supply after 1.5 liters so that you are not able to fill it with resin from third-party companies. So transferring the Tough 2000 V1 into the Form 4 cartridge shouldn’t actually work either?
Just curious if anyone here has actually tried printing with the previous generation resin on the 4L using v1.1 settings? I know from experience that, for example, printing elastic 50A v2 in v1 settings works so curious if anyone else here has actually tried to do this in an effort to use up old resin stock successfully.
From what I know the v1.1s are less viscous - one might assume because of the high speed mixer that wipes across. I wonder if there’s a way to slow it down via print settings to make prints successful 
Hey @leonhart88, you can slow down the wiper speed in Print Settings Editor if needed, under Wipe Speed and Wall Approach Speed.
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Cool thanks @henryqiu. Perhaps I’ll give it a try after some others chime in and tell me whether or not this will be a terrible idea 
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Hello leonhart88, how do you get around the 1.5 liter limit? According to formlabs support, the cartridges measure the weight of the cartridge. This means that even after a misprint, you shouldn’t filter the resin back into the cartridge. The cartridge adds everything to the 1 liter that was originally contained and apparently refuses to release resin at 1.5 liters. According to support, this is to prevent the use of foreign resin.
Adjusting the mixer speed is therefore the least of the problems. You create a new print profile based on one of the formlabs profiles for the corresponding material and reduce the speed of the mixer arm there, as henryqiu has already described.
I would just pour the resin into the tank manually. Not ideal but a short term work around until you exhaust the previous batch of resin.
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OK, of course that’s how it works.