Blob removal - print problem!
Hi from Australia!
I've just updated my Mk3 to Mk3S+ with the kit from Prusa and have had real issues getting the first layer to print well and also get a print to finish....I thought it may have been the filament, so I changed it to Prusa PETG (new in wrapper) and have had similar issues. I've attached images of the first few layers that appear to be de-laminating in a wave effect on the hotbed....I removed this and started again, left the machine for a few hours running the same print again and came back to a mega blob!
Mega Blob!
Questions:
1. What is the likely cause of the wave effect?
2. How the hell do I remove my mega blob without damaging the machine/hotend? I've already tried pre-heating it and pulling but it is solid!....
Thanks peeps!
Matt
RE: Blob removal - print problem!
Try dry the fillament it may be new but can still be damp and you may have to take extruder apart to remove blob
Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models
Your first layer Z calibration is too low.
You have a first class blob of doom. Search for blob of doom to see how others have dealt with them.
Before doing anything, look at pictures of a clean extruder and note the position of the rather delicate wires that are currently hidden, if you damage them you will have to buy replacement parts as broken wires can't be rejoined.
You have probably damaged your fan shroud and will need a replacement.
[Newcomers reading this: You should monitor your first few prints until you have made certain of your first layer calibration, in a week or so all will be working smoothly and leaving the printer running will be OK.]
To remove it:
Raise the nozzle temperature to the printing temperature for the filament in question and allow it to heat for several minutes.
If you are lucky you will be able to prise the blob open - more likely you will need to add heat from outside with a heat gun to aid the softening, sometimes it's worth using a soldering iron to carve chunks off the mass.
Use needle nosed pliers to prise this away; remove it in parts if it won't release the wires.
Once you have the worst removed you decide whether you need to disassemble the extruder to get at all the blob or perhaps you can clean up in situ.
After the cleanup there will be overcooked filament inside the nozzle so at least a purge and probably a cold-pull will be necessary.
Cheerio,
RE: Blob removal - print problem!
Thanks for the info - one for the morning I think! Add copious amounts of caffeine!
