First layer not sticking  

Re: First layer not sticking

I was having this same problem off and of this week. I'm in a very hot environment, which might also be contributing.

I had run Z calibration many times and thought I needed to get really close to the bed for things to stick. But whenever I tried to do a raft, first layer would catch the nozzle. I assumed this meant it needed to be closer to stick to the bed better. But really, I was way too close. I raised Z up (almost a half mm), to the point where it was barely deforming the layer at all, and the ends of each row were peeling up. Somewhere in the middle I found the sweet spot where the edges aren't curling, the middle isn't catching, and there's just a tiny sliver of bed visibly between each row on the first raft layer.

Re: First layer not sticking

And now that I've tried to offer advice, I can't get any prints to start tonight. Nothing is sticking to the bed and everything wants to climb up the nozzle. It's 35c in here so I am going to hope it's the high ambient temperature and try again in the morning.

Re: First layer not sticking

Hello All,

I have had some of the same issues starting out. My first printer is a MK3 with the PEI sheet. My fix for PLA is to use glue stick on the sheet before I print. Elmer's glue sticks with the purple glue works the best. It cleans off with water, and you can see where the glue is because it is purple until it drys. I have not had much luck with getting anything to stick to the bare sheet, it all breaks loose on the first few layers and gunks up the nozzle area.

Re: First layer not sticking

if adhesion gts bad, I clean the bed with dish wash detergent and water, rubbing it into the PEI surface with a sponge with

scotch bright surface rinsing clean and drying with a clean paper towel...

works for me...