Hi! Am printing a Darth Vader pencils cup for my office desk in Laybrick and am having a lack of extrussion in some points. Temperature is 160 and speed 30 mm/s. It only happens in some layers (in this case those three points) but is dissapointing. I dont have under extrussion with normal PLA, so why does this happen?? 
160c is way too cool. The temp range on it is 185-215…
@Ax_Smith-Laffin if I increase it to 180 it makes it even worse 
Do you have a partial clog?
Check for a clog. I would get a small wire that you can push inside the small hole in the tip while its hot. Wiggle it around, be cautious not to break wire off inside nozle. Manual run some pla through. After that Do a cold pull. When nozle reaches 80° start back feeding the filament out. If done correctly you should see kinda of the shape of the end of the nozzle and maybe a little strand were it was coming out of nozzle.
I don’t have any experience with laybrick, but 160 does seem low. I’m even more surprised if you say a higher temp makes it worse. Can you correlate this to a start or stop point for the given layer? Given the consistency of the location what about as the print head moves and its relation to how you’re feeding it?
First off I’d have to say 160! That’s way low!
Personally I use 210-220 and works great!
@Scottie_D369 have to agree. I’m printing at 230 with a all metal hotend.
@Javier_Prieto - as Keith says, check for blockages, and as Nephi says, cold pull. if it’s clear then it’s temperatures. It’s a PLA based Filament, so start with your PLA settings and work from there. Personally I’d be going for about 200-210 for my printers. EG, I have a Cute Octo on the go for someone atm. The infill was horrendous, increased the temp by 10c and it’s fine. Test with 5c increments until it prints correctly.
PS also the variants of PLA I have many times change the temp with the several colors I have. But I basically stay around 220 or try too. As low as 185 or high as 230.
There are many points here to test from but I’d agree with @Scottie_D369 . I keep my pla running 220 ±5 and have never run issues with it.
With PLA not lower then 210 but i get under extrution with that aswell. I go allways now with 230C. I get good flow and can print fast with the printer.
With ALL my filaments i do a “2 finger push test” which is where you push the filament into the hot end manually (holding with 2 fingers), with any pinch or drive mechanisms disabled. i start at a low temp - say 160 for pla. and increase the temp 5 deg at a time until the filament flows through the hot end nicely with a small amount of force. if it starts dripping out and you can feed the filament in too easily you have gone tooooo hot. i then mark the spool with that perfect temperature and print print print. i found even with the same manufacturer the sweet spot on different colours can vary by 5 deg either way.
Good luck!
Simple way to test. Nice.