3D Print of Monster Fidget Bundle

Love the design, and first print came out great visually. I'm using a new printer so I'm unsure if my assembly issues are related to a new machine i haven't fully dialed in or if parts are intended to be glued. Assembly instructions of some sort would be welcome, even if its just a mention if they're intended to be friction fit or glued (sry if I missed them). The spring seems to be a little smaller then the cavity on the body (have only printed the yeti so far) so the spring falls out very easi