I designed this basic simple drawer, as I couldn't find anything suitable to fit in Ikea Billy Bookcase that I wanted, to store Computer 3D Printer and Office ‘useful’ stuff ( I am not an experience designer so kept it simple) 185mm(w)x240mm(l)x140(h).

I have the height set so it is a snug push fit on the next shelf up. and with so there is a slight gap between each Drawer unit so not to drag the other one along when using. Obviously size can be adjusted to fit your requirements.

I didn't want handle sticking out so put small finger holes in.

The length is just short of been level with front edge of Bookcase

I used PETG.

It's very tight fit on heat bed of the Bambu X1C so check about using a brim. (I didn't and had slight lifting on Front edge)