There’s an explicit clause that exempts politicians from the ban. They get privacy because they need it, but nobody else does.

The very top layer would also have high cooling fan, no?

It could be your cooling fan is just waaaay too powerful, and causing the plastic to not flow and bond correctly to the lower (or following) layers.

I’ve been seeing your posts on Masto, but I guess I’ll reply here.

I don’t know what printer you have, and I don’t know if the feature works for all printers, but could you try and use PrusaSlicer to visualise the print where the issue presents itself. More specifically, you could get some interesting data from the “actual print speed” view. That way you can see what speed the printhead reaches.

However, based on your description:

• when the printer reaches high print speeds you get delam
• slowing down the print head reduces (but doesn’t eliminate delam)

Could you be reaching the limit of what your printhead can melt? Would it make sense to calculate the actual flow through your nozzle at those high speeds? Finally, how much part cooling do you have setup? Have you tried a skirt to keep the temps more consistent?

Not sure what you need to get approved. Buying a roll of ASA? It’s part of printer maintenance, and making it more reliable in the long run.

And if you don’t have ABS/ASA on hand… why is the printer in an enclosure?

It’s the PETG. Specifically, it is the softening on the following parts:

• y-belt-holder-R2
• y-belt-holder-tensioner-R2
• x-end-motor-R2
• x-end-idler-R2

I would recommend the following Y-axis mod for the MK4. I am still running this even on the MK4S, even though the Y-axis was modified on the MK4S.

Edit: Print those in ASA and replace them, tighten all the belts as usual, and I think your printer will be fixed.

My money is on the PETG starting to loosen and you losing tension on the belts.

You have the MK4 in an enclosure–I did too. At some point I stopped being able to print flexibles, but ASA/PCCF was still fine. Prusa support told me that the idler was getting loose and my hotend was losing grip on the fillament.

I had another print where there was a nearly 2-3cm shift in the layers between layer 5 and layer 80. Some of my belts had absolutely lost the plot. I reprinted everything in ASA or PCCF, and while upgrading to the MK4S rebuilt the printer with all ASA/PCCF parts. No problems since.

Interesting that the extra 10° makes such a difference for ASA and ABS.

I recently started printing with ASA in my enclosed MK4. I might have to try this.