Hello, Does anyone know of a long case for a clarinet wihout the need for taking apart?

I don't know if one is made.

However you should always take your clarinet apart after playing to dry the tenons & sockets to prevent them swelling making it difficult to take apart when you do need to or even cracking or rotting the wood. Even with a plastic instrument you can get problems if you don't dismantle it.

GRARR! ! ive seen them on ebay...couldnt find any on sale now...but i have seen them on ebay..might wanna keep checking there every now and then

I have made a full length clarinet case for my daughter. She has a new, cheap Ebonite Kohlert. When she takes it apart she would sometimes bend the linkage or cause a spring to disengage. I tried greasing the corks into the next century but the problem remained. The case is not yet completed but seems to be a valid answer. It is 4" X 4" X 30" constructed out of 1/4" plywood. I am in process of getting hardware (Very expensive) and my wife is going to upholster it with fake blue velvet. Seems like a great solution for the student model that she plays. There are no real plans for this but if interested I will post photos when completed.

'I tried greasing the corks into the next century but the problem remained' - if the joints are still tight after greasing they can be eased by thinning the cork a bit with medium geade sandpaper but first you will have to get rid of all the grease you've put on.
Then your daughter needs to be shown how to assemble the clarinet safely. If she ever gets a wooden instrument she must take it apart to dry the tenons & sockets.
All much less effort than faffing around making cases & better for the clarinet!

Metal clarinets were made in one piece and hence came in full length cases. Perhaps you can find one of these.

Look on E-bay

I’m not sure about eBay. You may not find the same good deals every day. I chanced upon Hyson Music and found that they have Protec cases for one-piece body clarinets. It comes with a lightweight frame and exterior pockets for storage. With their free shipping for orders over $49, I couldn’t find a better deal elsewhere. They are listed on eBay as a merchant too.