adhesion to bed issues Hi, Using PLA I managed to print with great results the android sample using no raft with a 0.3 and 0.2 layer height without any detachment from bed. I suspect that the flat surface area of the android makes the adhesion to the bed more reliable. Now it was time to print something more advanced that is not flat like the android so I used the skeinforge raft option (makes rectilinear lines between bed and object for support) . However I`m having problems with prints getting of bed after the very few layers. I also noticed that if I switch off the fan there is a slight improvement, but I don`t think it is the way to go as the print seems to collapse due to heat. How can I sort out this problem? should increase bed temperature to say about 80deg cel ? and how can I do this? Is it possible to print a flat surface pad on the first layers underneath the raft so to improve adhesion to the bed ? Leander https://reprap.org/forum/read.php?292,294360,294360#msg-294360 Sat, 17 Oct 2026 01:29:37 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?292,294360,297962#msg-297962 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,297962#msg-297962 bjarkethomsen Mendel90 Mon, 20 Jan 2014 05:18:16 -0500 https://reprap.org/forum/read.php?292,294360,297939#msg-297939 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,297939#msg-297939 Problem solved. Thanks everyone ! :)]]> leanderborg Mendel90 Mon, 20 Jan 2014 04:23:18 -0500 https://reprap.org/forum/read.php?292,294360,296959#msg-296959 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,296959#msg-296959 bjarkethomsen Mendel90 Sat, 18 Jan 2014 07:34:25 -0500 https://reprap.org/forum/read.php?292,294360,296553#msg-296553 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,296553#msg-296553
Quote
leanderborg
M83 ; use relative distances for extrusion
G28 ; home
G1 X0 Y98 F9000 ; Go to the middle of the front
G1Z0.05 ; close to the bed
M104 S185 ; set extruder temp
M190 S70 ; set bed temp & wait
M109 S190 ; wait for extruder temp [first_layer_temperature]
G92 E0
G1 X50 E5 F200 ; make a thick line to prime extruder
G1 E-1 F1200
G1Z0.3 ;lift Z


should this set the temperature to 190 for the first layer then revert to 185 ?
Sorry but i`m newbie to gcode !

gcode is run sequentially - it's just a list of instructions that tells the printer to do a bunch of things one after the other.

It's not a good idea to leave the extruder at extrusion temperatures for long periods as the filament can burn and oxidise inside the nozzle so that's why most people heat the bed first (which takes longer) before heating the extruder (which takes about 3 minutes for ABS temperatures on mine).
The various heat/heat-and-wait commands allow you to do this without having to wait an extra 3 whole minutes (I bet you guys are the same impatient guys who use activator on super glue :D) by allowing you to start heating the bed whilst the extruder is still warming up.

Slic3r has the ability to set different temperatures for first and subsequent layers and as Nilez says the settings are pretty obvious in the dialogs.

I'm not sure how Skeinforge does it but unless there's a setting that overrides your start gcode AFTER the first layer then I don't think this will do what you think it does. I think you may need to wait for someone with Skeinforge knowledge.

There's a good gcode reference here by the way.]]> QuackingPlums Mendel90 Fri, 17 Jan 2014 12:34:19 -0500 https://reprap.org/forum/read.php?292,294360,296500#msg-296500 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,296500#msg-296500 Nilez Mendel90 Fri, 17 Jan 2014 11:02:51 -0500 https://reprap.org/forum/read.php?292,294360,296412#msg-296412 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,296412#msg-296412
Well, I'm a total newb as well so I haven't played with this with the use of Skeinforge (In Slic3r these options are a little more obvious btw). Maybe an expert can chime in at this point :D....]]> Nilez Mendel90 Fri, 17 Jan 2014 08:45:30 -0500 https://reprap.org/forum/read.php?292,294360,296399#msg-296399 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,296399#msg-296399 G28 ; home
G1 X0 Y98 F9000 ; Go to the middle of the front
G1Z0.05 ; close to the bed
M104 S185 ; set extruder temp
M190 S70 ; set bed temp & wait
M109 S190 ; wait for extruder temp [first_layer_temperature]
G92 E0
G1 X50 E5 F200 ; make a thick line to prime extruder
G1 E-1 F1200
G1Z0.3 ;lift Z


should this set the temperature to 190 for the first layer then revert to 185 ?
Sorry but i`m newbie to gcode !]]> leanderborg Mendel90 Fri, 17 Jan 2014 08:23:45 -0500 https://reprap.org/forum/read.php?292,294360,296357#msg-296357 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,296357#msg-296357
I think you have to set it using some custom gcode lines in the start_PLA.gcode file. Otherwise I think the temperature tab in Skeinforge maybe offers some settings.
Here is some good info on the gcode editing (in this case intended for use with Slic3r):

[forums.reprap.org]]]> Nilez Mendel90 Fri, 17 Jan 2014 07:06:29 -0500 https://reprap.org/forum/read.php?292,294360,296246#msg-296246 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,296246#msg-296246 I checked the bed surface temperature using an infrared temp probe and it is indicating 50 at start and goes up to about 60 after 10 minutes into the print

I have my printer in a cold room 16deg cel. And I suspect that this is the problem.

modified temperatures on the start_pla.gcode file:
bed ----> 70 to 75
hotend----> 185 to 190
I got good results and managed to finish the print without warping.
I rechecked the bed surface temperature and now it is 55 at start and goes up to about 68 after 10 minutes into the print

How can I set these temperatures to the first layer only and not for the whole print?]]> leanderborg Mendel90 Fri, 17 Jan 2014 03:40:28 -0500 https://reprap.org/forum/read.php?292,294360,295506#msg-295506 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,295506#msg-295506
Depending on the PLA it will require different "tricks" to get it to stick correctly. I have heard people use blue tape, PVA glue, glue sticks, hair spray, lemon juice, sugar juice to get PLA to stick. Most people use blue tape and some use hair spray, I personally use a glue stick (the one that starts purple and turns clear) on glass.

Good luck.]]> RyanMark Mendel90 Wed, 15 Jan 2014 21:21:23 -0500 https://reprap.org/forum/read.php?292,294360,295407#msg-295407 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,295407#msg-295407 Nilez Mendel90 Wed, 15 Jan 2014 17:46:50 -0500 https://reprap.org/forum/read.php?292,294360,295363#msg-295363 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,295363#msg-295363 leanderborg Mendel90 Wed, 15 Jan 2014 17:12:10 -0500 https://reprap.org/forum/read.php?292,294360,295354#msg-295354 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,295354#msg-295354 Nilez Mendel90 Wed, 15 Jan 2014 17:01:34 -0500 https://reprap.org/forum/read.php?292,294360,295298#msg-295298 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,295298#msg-295298
I forgot to mention that I was using acetone in the above post. Before changing any settings I will try vinegar and then will see from there.]]> leanderborg Mendel90 Wed, 15 Jan 2014 15:44:20 -0500 https://reprap.org/forum/read.php?292,294360,295262#msg-295262 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,295262#msg-295262
Here are a few good threads on this topic:

[forums.reprap.org]
[forums.reprap.org]
[forums.reprap.org]
[forums.reprap.org]

I get all my PLA prints to stick on glass cleaned with household vinegar. Give it a good scrub with a normal paper towel till you hear it squeak. Every once in a while I clean it with a brush and some dish soap.

Regards,

Niels]]> Nilez Mendel90 Wed, 15 Jan 2014 14:42:33 -0500 https://reprap.org/forum/read.php?292,294360,295253#msg-295253 Re: adhesion to bed issues https://reprap.org/forum/read.php?292,294360,295253#msg-295253 leanderborg Mendel90 Wed, 15 Jan 2014 14:15:44 -0500 https://reprap.org/forum/read.php?292,294360,294360#msg-294360 adhesion to bed issues https://reprap.org/forum/read.php?292,294360,294360#msg-294360 Using PLA I managed to print with great results the android sample using no raft with a 0.3 and 0.2 layer height without any detachment from bed. I suspect that the flat surface area of the android makes the adhesion to the bed more reliable.
Now it was time to print something more advanced that is not flat like the android so I used the skeinforge raft option (makes rectilinear lines between bed and object for support) . However I`m having problems with prints getting of bed after the very few layers. I also noticed that if I switch off the fan there is a slight improvement, but I don`t think it is the way to go as the print seems to collapse due to heat.
How can I sort out this problem?
should increase bed temperature to say about 80deg cel ? and how can I do this?
Is it possible to print a flat surface pad on the first layers underneath the raft so to improve adhesion to the bed ?

Leander]]> leanderborg Mendel90 Tue, 14 Jan 2014 04:17:34 -0500