So, im working on some parts for work right now that require smooth surfaces. I am prototyping a resin shoe for a carbon fiber winding machine. basically the part is a block with little valleys in it that the fiber travels through and gets soaked in resin. so its important these valleys are very smooth. my question to you guys is: what do you do to smooth parts. im not talking anything atheistic im talking about maybe a glaze or enamel you recommend with pla/pha.