Print solid (100% infill), with somewhat thick walls.This pocket friendly tool is a wrench for opening stubborn tank atomizers. It is dimensioned for 22 mm tanks, but it works with 23 mm atomizers as well. I suggest that you print two copies, and use them in conjunction.If you want to make a tank tool in a different size, you can adjust the scale of the X and Y axes to the following percentage before you print:23 mm atomizers = 105%.18 mm atomizers = 82%.16 mm atomizers = 73%.14 mm atomizers = 64%.You can increase the Z axis scale for a more durabIe tool, but keep in mind that overdoing it will make the tool awkwardly rigid.A slightly larger version here: https://www.youmagine.com/designs/larger-tank-tool