Ender 3 4" Height Extension

Ender 3 printers don't have enough clearance under the top 2020 aluminum profile for the teflon tube and wiring to move along the x axis without rubbing, so you can't really print things much over 220mm tall. Just print two of these, remove the top 2020 crossbar, install these on the top of the 2040 side profiles and then replace the top crossbar on top of these extensions. If you use some t-nuts and bolts in the provided holes, you should still be able to pick the printer up by the top bar. I printed mine in black carbon pla+ and it's plenty strong, although I didn't use any hardware to attach them and I don't pick it up from the top. I hope this helps someone.