An OpenSCAD variation on the loc-line cooling hose, usable as cooling for a 3D printer. It seems to work better than other cooling variants I've tested, and allows adjustments of the cooling end, which is so hard to get perfect otherwise. Depending on your 3D printer settings, you might need different "size offsets" between the hole and the round part (in my STLs set to 0.2mm, which seems to work with my printer). If thats the case, just use the SCAD file instead of the STLs, and change top_diff_size value.