Modified the original model to make it more robust.  I found the original hard to print and fragile.  This is for a 15x15x40mm bubble level as found on Amazon.  Not the bubble that comes with the H2D rotary accessory.  If the bubble is loose, add a bit of adhesive to the end.  If too tight, scale the model up a percent or so in Studio.  Best printed on its side using PLA with PETG for supports.  If you buy the bubbles with the attached magnet, just peel off the magnet.