Need help with bumpy / lumpy prints

[chambrot]

Hi all,

I have had this issue for a while, but its never been a big deal until now that I started selling prints. I am looking to achieve the cleanest possible prints and I think I am almost there.

The problem that I am having is that my prints are slightly bumpy on the first couple of layers when I try to print something with a bevel, rounded edge or slight edge overhang. From the bevel up the print is near perfect. I have also noticed that even though the bottom and top bevels are the same size the bottom one tends to be a bit distorted and not quite the same as the top.

I have attached an illustration of what I am running into.

I am using a Makerfarm Prusa i3v 10" with a heated bed. I am running Hatchbox PLA, with the hotend at 195 and the bed at 60. Running at 80mm/sec with 50% speed on outlines. I currently do not have a fan cooling the print and I am hoping thats not the issue, lol.

Any tips or help would be greatly appreciated,

Chambrot

[CompoundCarl]

I know that sometimes when I am printing too close to the bed, the extrusions become irregular and bumpy. So you could try adjusting the first layer position to see if that makes any difference. Also make sure your bevel isn't too steep, because if it is, then you may need supports under there too.

[frichard7]

This article at all3dp.com may help you figure out the problem.

Troubleshooting Guide to 14 Common 3D Printing Problems.
https://all3dp.com/common-3d-printing-p ... ing-guide/