Prusa i3 Hephestos: Print slides on bed.
October 21, 2014 12:15PM
First time printer, first time poster.

I built the Prusa i3 Hephestos from a kit (http://www.bqreaders.com/gb/products/prusa-hephestos.html).

When I try to print, after 30~ seconds the printer pushes the print, and so it starts sliding off of the glass bed. I believe this happens when the bottom layer of PLA cools.
I have levelled the bed so that a sheet of paper can slide under the five points.

Can someone explain in relatively simple terms why this happens and how to fix it?

Thanks.
Re: Prusa i3 Hephestos: Print slides on bed.
October 21, 2014 08:09PM
Why? The plastic isn't sticking to the glass well enough.

How to fix? Use a heated bed, and/or hairspray, gluestick, etc.


MakerFarm 8" Prusa i3v
RAMPS 1.4
0.4mm E3D v6 for 1.75mm
Re: Prusa i3 Hephestos: Print slides on bed.
October 22, 2014 04:37AM
if your hotend pushes the print from the glass bed, your steps/mm for your z-axis is set wrong.
Re: Prusa i3 Hephestos: Print slides on bed.
October 22, 2014 05:04AM
According to the URL that you posted:

Quote
Prusa i3 Hephestos
Glass base (non-heated): 220 x 220 x 3 mm

If you do NOT have a heated bed then you can not print PLA on glass!

If (contrary to what it says on the website) you do have a heated bed (which I assume is the case) then you need to either raise the temperature (60°C should be fine) of the bed or the temperature of the extrusion.
I usually print PLA at 210°C.
When I am using support if I print at 200°C then it has problems sticking in one corner, if I print at 210°C it has no problems at all.


Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse
Re: Prusa i3 Hephestos: Print slides on bed.
October 22, 2014 12:43PM
No heated bed, it didn't come with the apparently "complete" kit. Yet it did come with glass. What material should I print on then?
Re: Prusa i3 Hephestos: Print slides on bed.
October 22, 2014 07:40PM
Put some blue painter's tape on the glass, see how that does. I don't remember if it needs heating as well or not.


MakerFarm 8" Prusa i3v
RAMPS 1.4
0.4mm E3D v6 for 1.75mm
Re: Prusa i3 Hephestos: Print slides on bed.
October 23, 2014 02:33AM
Do yourself a favor and add a heating element.
PLA on heated glass works great!


Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse
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