Well crap, Ive been saving drills and jackhammers up all year for the next cb and today decided that if I got them once, I can get them again, so I sold them for barn space. Lol, typical of me to not bother to check for new news before I make a decision.
I keep 200 of each, and 150 expansion tools. I have 54 each of drills, jackhammers and saws. And in the Tool Exchange I have 3 of each ready to be exchanged. So I will be ready when they do anything. I sell any more that come in. If I needed barn space though I would just sell them all though.
To me, the answer depends entirely on how important it is to you to be able to build the new CB or enclosure the moment we update or whether you are ok with working for it after the update arrives. Unless they also add housing and a factory needing that population, there really is no game play disadvantage to waiting to finish the next CB they add.
Same with zoo enclosures. Apart from a small tcash reward for finishing an enclosure and animal family, there is no game play difference between finishing the new enclosure in 3 days or 3 months.
Personally, I will not be tying up 700 barn spaces with materials and tools I may not need for months. OTOH, If your barn is big enough that it doesn't hamper you, then there's no real downside to keeping it.
Looking at the cb page in the wiki, they have been following a pattern of bricks, glass, slabs, each increasing by 6 for the last several CBs. If that holds, the next one should want Bricks, probably 125-130, plus tools.
I’ve been selling everything until I get all my factorys built. I have all my city building built, and my zoo enclosures are going to wait until I get my last two factorys built. I figure the time it takes me to save the coins to buy the enclosure, I’ll have enough mats to finish them when I need them. Room in my barn right now suffers from being a hoarder from the racing event, lol. All the milk, eggs, bacon and so on, I don’t want to get rid of it. As soon as the event is over my barn totals will start going down from using all the extra farm animals stuff. Even though I’ve had to sell some of that stuff, I really don’t like to. lol
I guess it gets easier as your barn grows... I can always sell some if needed, but my barn is never full. Also I haven’t found it as hard as other players to collect things because I didn’t build the last few factories. It jus5 seemed like more work to fill more shelves, and more to store in barn...I haven’t needed them so far..if that changes I guess the tools will diminish fast...but At the moment I’m always selling them to keep those numbers level.