How to make a 3D Printed Cake Topper using Cookiecad

Hi Nathan, do you have any tips as to the slicer setting to print. Ive tried and my surface has a lot of separation and gaps. Theyre not smooth on top. Ive asked in 2 facebook groups trying to get help as im new to 3d printing. i printed the owl test print a cookie cutter and a name keychain successfully but the cake topper is a gappy mess! I use Cura and PLA Thanks so much!