Best remedy, get yer' check book out, contact Mimaki, and get a replacement top. I've had to replace them on a Fuji I used to run, one of the shop workers brought in a pallet of parts to print, ended up dumping it and put some dents in it. We tried to fix it, but it didn't work so well, affected the vacuum too. If the cost is anywhere near what that was, you won't let another one get dented.