prints lifting to such an extent that the surface turns into one large curve.
For regular PLA I would say the bed should be at 70C and you should add gluestick. For prints larger than 5 inches across you should use 1 part wood glue mixed with 3 parts water, mix well, paint on with a paint brush, and let dry as the bed heats up (takes about the same amount of time to dry as the bed to heat up). Also the brim needs to look perfect - squished down and with no gaps between each stripe which means you need your bed height almost perfect. Also bottom layer should be thicker than .1mm (.2mm is good) but no thicker than .3mm. If there is a gap between the brim and the part - abort. If gap is caused by extruder clicking - bed is too close to nozzle. If gap is on every line in brim, bed is to far from nozzle.
Because the glass temp of PLA is around 50-60C, having the bed at 70C means that the part would rather deform slightly than lift off the bed. Yet 70C is cool enough that you have to push/pull very very hard to get it to deform. So usually 70C gives you a very good result on the bottom layers.
But don't try to remove the part until it is below it's glass temp. So for PLA45 it needs to cool more than regular PLA.
Recommended Posts
gr5 2,224
I've never used PLA45 and haven't heard much about it but it sounds like it is meant to be printed on a cold bed. I would keep the bed below 45C (I assume that's the glass temp) and maybe even keep it below 30C or just at room temperature.
This means you probably can't print on glass so I would use the roll of blue tape that comes with the UM2 (or preferably get some wider tape - I use 2" wide, illuminarti uses 6" wide blue tape).
It's important to clean the top of the blue tape with isopropyl alcohol before printing on it. This removes the wax on top and allows PLA to stick to it better.
It also sounds like it was invented before heated beds were common and it's possible that all PLAs out there are "low shrink" compared to ABS and the whole product is not any better than modern PLA formulations. But I really don't know.
I hope you get this to work.
Link to post
Share on other sites