The 1st couple of 'canes I made were bumpy on the inside, too, but by the 3rd one, I finally figured it out .... I kept the insert in the mold until the wax was a soft solid between the mold sidewall & the insert. Then, I'd remove the insert & pour the rest of the wax back into my presto pot. It finally occured to me to remove the insert, then allow the wax to solidify just a little longer, THEN pour out the rest of the wax. I got smoother walls that way. However, if you were just trying to make a 'blank' 'cane, did you even use an insert? If not, then what I wrote above may not be the cure. To make sure I have a nice, smooth, level bottom, after I unmold the 'cane, I pour just a little more melted wax onto the bottom. I'll also use my heat gun on the sides but then I find I have drip thingys. Oh, Hurricane Queen, Donita, what do you think? Have you noticed how smooth her 'canes appear?