# What to do with left over resin in resin tank?

**URL:** <https://forum.formlabs.com/t/what-to-do-with-left-over-resin-in-resin-tank/28596>\
**Category:** Materials\
**Created:** [August 24, 2020, 2:56pm UTC](https://forum.formlabs.com/t/what-to-do-with-left-over-resin-in-resin-tank/28596 "2020-08-24T14:56:38Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![rkagerer](https://avatars.discourse-cdn.com/v4/letter/r/439d5e/32.png) [@rkagerer](https://forum.formlabs.com/u/rkagerer)\
**Post date:** [August 25, 2020, 11:34pm UTC](https://forum.formlabs.com/t/what-to-do-with-left-over-resin-in-resin-tank/28596/3 "2020-08-25T23:34:48Z")

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@Randy_Cohen is correct, you never want to pour resin back into a cartridge (unless you don’t care about potentially contaminating the rest of the cartridge’s contents).

You may also want to check in on this thread once it gets a response from Formlabs:

> [@Pouring resin out to extend tank lifetime?](http://forum.formlabs.com/t/pouring-resin-out-to-extend-tank-lifetime/28591/12):
>
> I was recently in touch with the European support department about this. They did suggest emptying resin out to extend lifetime of a tank, but could not guarantee it. So this kind of raises the question of what happens if we follow the advice, and the tank leaks on week 11 (when using Engineering resins or Tough, for example). As a hobbyist who does not run a business or company, having to replace a tank after only maybe having time/funds to print 1 cartridge becomes very expensive in the long …

There was some suggestion that emptying the tank may prolong its lifetime, if you’re not printing frequently. If you go that route, you’ll want to filter and store it in dark place in an opaque container.

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