This 90 degree angle for furniture at a bookshelf that long ago just broke took me like 1 hour on Fusion 360 and some YouTube tutorials to replicate them. 3D printing is amazing, not gonna lie, the printer investment was a bit high but this kind of things is what paid to me all the work that cost me my machine. I even have a really simple but trustworthy machine (Anycubic Kobra 2), that one time save me a print with support on the air. You don't have to make a really big investment on a Bambulab or a fancy printer to make really simple improvements on your things.