Hello guys, do you know why this happens?
It’s dirty in the first, btw it models are two of the picture.
Could be a lot of different things or a combination. Looks like you are under extruding and not sticking to the tape. Is your nozzle damaged or obstructed? Do you have chip in the hobbed filament drive gear? Do you have a heated bed plate?
You could be too cold or need to heat up the bed. For PLA try something around 210 (see below to figure out the proper temp range) for the filament and 60 for the bed till you get to 0.5mm high then turn it down to 45. This allows the first layer to stick really well and then cool to a point that it will not warp or peel up.
I would not use masking tape. It is too smooth and shiny. After many thermal cycles it will get brittle and really guns up your bed surface. Use 3M Blue painters tape - interior, if you are using tape on aluminum. If you wipe down the bed with Windex the tape sticks really well.
The initial extrusion layer looks squished so I think your bed leveling is ok but you might want to tighten it up just a tiny bit.
If you raise the head about 35mm above the bed and extrude out a steady strand how does it behave? Does it drop down in a straight strand after a bit and coil like a rope (good) or does it stay clustered under the nozzle making a big curly goober (too cold)? If when you stop the extrusion the vertical strand tips over and strings then you are too hot.
…as for being dirty at the start it looks a little burned. Does it do this each time you try to print? Are you leaving your printer hot for long periods of time with no extrusion?
its too thin, i make this also… but you can look on the layer view to check that the program generate all layers.
Thanks for your answring, everyone! I fixed it and why it happens because Z axis are downed, so it becomes dirty.
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can you teach me how to model glasses in CAD? haha, I want to make glasses, and dentures on my printers…
@Slim_Vision Oh sorry, this is not my model. I got this in thingiverse.