PETG Wavy First Layer
Hello,
I received a factory assembled MK4S a few weeks ago and have been dealing with some 1st, 2nd, and 3rd layer issues. I am getting my best print results when I apply a o.o3 mm Z offset, but I’m still getting a wavy first layer appearance on the back center and back left part of the print bed. (Picture below) At a 0.03 Z offset, the issue normally doesn’t become too much of a problem, but some 3rd layer tear out does occur (Picture below). Luckily, the infill starts at the 4th layer so I think the print would be fine, but I have yet to commit the 14 hours needed to finish the print. Small prints have not given my any real issues. I’m using Prusament PETG filament with normal setting minus having the nozzle temp at 255. Could any other changes be made to alleviate this wavy appearance which I believe is the cause of the tear out I’m experiencing? Prints done without changing the Z offset (keeping it as 0) experience significant tear out on layer 3 which has caused me to abort the prints.
Any advice is greatly appreciated!
RE: PETG Wavy First Layer
I usually use 0.04 Z-offset not much different from yours, to avoid the waves, so I think you’re on the right track. I’ve seen tearing like that in places where there are fingerprints, so make sure your build plate is thoroughly degreased. Also, make sure your filament is dry.
MK4S/MMU3
RE: PETG Wavy First Layer
I find that I can reduce that affect by reducing the temperature for the first layer by 5-10 degrees. It is a bit of a balancing act because reducing the temp means you may risk the model not sticking to the build plate. If that is the case I then add a brim. I noticed you are using PETG which sticks great to PEI. I usually add baby powder to my PEI to prevent it from damaging my build plate when I remove the model.
I hope this is helpful.
RE: PETG Wavy First Layer
I recently watched CNC kitchen's latest video about the new H2D and complaining about a very poor first layer. It seems to have been related to an uneven temperature distribution of the print sheet, where more waviness appeared on the hotter areas of the print sheet. So reducing temps might actually be a good way to go.
X&Y layer shift MK4S
Hi, we brought couple of MK4S printers' factory assembled, and we expect good result from the printers after the first print, unfortunately most of the prints went to layer shift on X and Y axis, even we tried different files same as the result. have you anyone face kind same one...? we're using PTEG filament.
A picture of a typical failure might help us understand what's going on.
Cheerio,
RE: PETG Wavy First Layer
HI, I'm really sorry about sharing images or videos our print. here it is prohibited.
So print a similar file or one supplied by Prusa and assuming it fails similarily, show us that.
Cheerio,
RE: PETG Wavy First Layer
Try setting Z-offset slightly more negative (e.g., -0.05mm) and use "Elephant Foot Compensation" in PrusaSlicer to reduce over-squish on outer layers. PETG sticks very differently than PLA and hates grease or inconsistent surfaces. Clean the bed thoroughly with dish soap + hot water, then isopropyl alcohol. Repeat this every few prints.