Old flat top

thingiverse

It gets the job done, despite its rough appearance. The increased surface area allows you to feed the pipe directly into the top. I had to resize it to fit my 3D printer, so sorry if it doesn't match the original design exactly. It was printed with a 0.2mm layer thickness using PLA material and features 50% infill density, along with supports that have been oriented with the flat part facing downwards.