[Solved] Prints no longer sticking - Smooth Sheet  

Prints no longer sticking - Smooth Sheet

I had my CoreOne kit assembled for about a week now, I been printing new temp tuning towers.  No issues, all printed out fine all PLA and PETG materials from Hatchbox, Overture, 3DSolutech.  All towers on their skinny base adhered with no issues.  

I ran some small prints prior to the temp towers with no issue and had some difficulty to get the prints to flex off the sheet. 

After my last successful temp tower, I started a larger productions print.  The print started and immediately all the extrusion started to come loose off the sheet.  I cancel the print tried again, same results.  Now I printed on glass with hairspray prior to getting the CoreOne.  Never use PEI.  

So I did some reseach it said to raise the bed temperature, it was printing the temp towers on about 55-60C, no issues with sticking so I raise the bed temperature up, got a little further along but first layer and perimeters would quickly detach. 

So make this short between ChatGPT and experimenting with print settings

1 Increase the bed temperature to as high as 80C for PLA No luck

2 I increase the first layer to as high as the filament spec stated - no luck (cooling is disabled for first layer )

3 I wiped down the sheet with IPA alcohol - no luck

4 I washed the sheet in Dawn dish detergent - dried - wiped down with alcohol - same results

5 I wiped down again with Isopropyl Alcohol and still no luck

I don't know what change but nothing will adhere to the sheet now, I tried all different bed and first layer temp setting, added brims, rafts and nothing will stick now.  

This sheet is not even a week in use and I printed a few small prints and temp towers, had problems getting prints to unstick now nothing sticks at all. 

I followed everything I could find in ChatGPT and Grok and can't getting prints to stick to the bed.  

Do I need an adhesive, the only one I know to use is hairspray or Elmer's glue?

It was like a switch was thrown and nothing sticks now.  The specs for my filaments give bed temps from 50-70C which was working before.