This is a modular comic book stand with sizes from 20mm to 50mm wide. Each size has a beginning and middle piece with an end piece that fits all pieces. When assembling it is best to slide them together from back to front like shown in the gif. Make sure ALL strings from the supports are removed or else the pieces will not slide together. All pieces are in one 3MF file for organization with each plate labeled with which size and part. The setting "View, show labels" will also help if needed. Keep Supports set to manual. The dove tails are the only thing that needs supports. The hole for the tabs on top will print fine without any at all.  I have had the best results with Overtrue PLA in my opinion but i will be testing more materials in the future. There is a removal tool also which is still a work in progress, so use carefully.