I have tried twice to print the “test” Marvin file, and both time when the printer gets to the key ring loop everything goes bad. The first print the key ring was a gobbled mess,(picture 4) so i tried again, and when the print got towards the top i slowed the print speed to 50% (using pronterface). Any ideas of what to try next? I glued the “ring” portion back on which is the substance you can see in the first 3 pictures. Also you can see a difference in the texture on the backside of the print, maybe the bed is not level?
Printer - Prusa i3
Material - PLA
Print that area slower! so you could have say a 15 sec min layer time! this would print most of the marvin fast and then slow down for the key ring.
Some more settings might help to identify the issue. What temperature was it? 
Temp was 185, i am pretty new to this and there are so many speed settings i am a little overwhelmed. Will i have to change the extruder speed as well? Sorry i dont have more of the settings, i am at work now and didnt think to write them down.
Somewhere on your slicer settings there will be one called minimum layer time, to me it looks like the printer is running to fast over the small area, and thus not giving the layer enough time to cool before the next one is put down on top, this has an accumulative effect and mushes the plastic up…
so by increasing a min layer time, you essential give the layers enough time to cool.
i am using slic3r, but i will check that out when i get home tonight.
Getting a good quality marvin is good training! as the experience you gain from messing around with settings can be used when you start printing for real!
1 Like
Nasser
8
Hi
I got the same issues when i first test printed Marvin, which got me a not very good review on the Hub!
I’m using a 3d Systems Cube 3d Printer
Unfortunately, i cannot find a place to edit my printing settings…
Time to improve to a new printer… :S
Have your tried printing multiple marvins one further removed from each other?
You should be able to change print settings in your slicer! i.e. print speed, layer height, infill, no of shells… all the important basic stuff! I don’t think there are any slicers out there that do not allow mods to these settings…please correct me if I am wrong.
No i have not, i am going to try slowing the print down, and print a second copy to see if that will help.
The one thing i am worried about, is everyone says the print takes about 45min, the two that i printed took 1 1/2 hours each, and still messed up. I am thinking speed is not my only issue.
Can you confirm that you have active cooling on your printer? Is there a fan, blowing onto the print, in the immediate area of the nozzle? I’ve never printed a successful Marvin without cooling. It’s just too small. Even if there’s not much plastic being extruded on each layer, the heat from the nozzle will probably be enough to warm up the print too much. Worth making sure your hot-end insulation is intact.
cheers,
AndyL
Pot8oSH3D
yes, that was one of the first things i checked, was that the fan was working.
Seem to recall my first Marvins were like 20 min or so. What layer height are you running at?
Stanos
16
Multiple copies is the best way to get good quality on the keychain. Unless you have the settings which make the nozzle hover away from the print for a few seconds each layer. Try printing 3 or even 4 of them.
i printed 2 last night at the same time and the “key loop” did come out a little better.
