Hi all, I have recently built a Prusa Air 2 and am having some issues. The hot end will sometimes strike the bulldog clips used to hold the heated bed and glass, I have to remember to have the head in the middle of the bed before starting a job or homing - otherwise it can happen. Any idea on how to prevent this? Its very annoying as the printer can get damaged if I forget to centralise the head! Thanks Ash https://reprap.org/forum/read.php?267,184770,184770#msg-184770 Mon, 13 Apr 2026 02:16:36 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?267,184770,186354#msg-186354 https://reprap.org/forum/read.php?267,184770,186354#msg-186354 -------------------------------------------------------
> Ah yes 70C is no problem, I was thinking of 130C
> for ABS.
>
> It does take a long time for the Z axis to decend
> 200mm but I switch the bed on first so no time is
> wasted.


I saw someone used Sugru (silicone putty) and it can handle up to 180c for extended time. I have some covering up my heated bed solder joints to prevent shorting and to give a physical connection. I had one wire break at one time.

The Sugru sticks to almost anything but can be removed with a razor if needed. It's like play doh or clay and he molded a rim around the glass without going above the glass.

Myself I like to change out my glass as I have several and I print, then set it on an aluminum sheet to cool as I pop in another glass to start printing again.]]> tmorris9 Repetier Wed, 20 Feb 2013 20:59:14 -0500 https://reprap.org/forum/read.php?267,184770,186350#msg-186350 https://reprap.org/forum/read.php?267,184770,186350#msg-186350 ashhhhh Repetier Wed, 20 Feb 2013 20:43:20 -0500 https://reprap.org/forum/read.php?267,184770,185024#msg-185024 https://reprap.org/forum/read.php?267,184770,185024#msg-185024
It does take a long time for the Z axis to decend 200mm but I switch the bed on first so no time is wasted.]]> nophead Repetier Fri, 15 Feb 2013 17:09:15 -0500 https://reprap.org/forum/read.php?267,184770,184902#msg-184902 https://reprap.org/forum/read.php?267,184770,184902#msg-184902 james glanville Repetier Fri, 15 Feb 2013 08:53:43 -0500 https://reprap.org/forum/read.php?267,184770,184896#msg-184896 https://reprap.org/forum/read.php?267,184770,184896#msg-184896
I just set up the firmware to have the origin in the middle of the bed instead of where the end stops are and home Z to the top to avoid the clips.]]> nophead Repetier Fri, 15 Feb 2013 08:36:27 -0500 https://reprap.org/forum/read.php?267,184770,184887#msg-184887 https://reprap.org/forum/read.php?267,184770,184887#msg-184887 james glanville Repetier Fri, 15 Feb 2013 07:52:07 -0500 https://reprap.org/forum/read.php?267,184770,184844#msg-184844 https://reprap.org/forum/read.php?267,184770,184844#msg-184844 repetier Repetier Fri, 15 Feb 2013 03:21:08 -0500 https://reprap.org/forum/read.php?267,184770,184837#msg-184837 https://reprap.org/forum/read.php?267,184770,184837#msg-184837 However, I wouldn't limit the print size because a clip. I would rather try to find a larger glass or some other way that doesn't limit the print size.]]> fsamir Repetier Fri, 15 Feb 2013 03:00:25 -0500 https://reprap.org/forum/read.php?267,184770,184800#msg-184800 https://reprap.org/forum/read.php?267,184770,184800#msg-184800 Surely if I change it this will be thrown out?]]> ashhhhh Repetier Thu, 14 Feb 2013 22:14:59 -0500 https://reprap.org/forum/read.php?267,184770,184786#msg-184786 https://reprap.org/forum/read.php?267,184770,184786#msg-184786 fsamir Repetier Thu, 14 Feb 2013 20:51:29 -0500 https://reprap.org/forum/read.php?267,184770,184770#msg-184770 https://reprap.org/forum/read.php?267,184770,184770#msg-184770
I have recently built a Prusa Air 2 and am having some issues.

The hot end will sometimes strike the bulldog clips used to hold the heated bed and glass, I have to remember to have the head in the middle of the bed before starting a job or homing - otherwise it can happen.

Any idea on how to prevent this?
Its very annoying as the printer can get damaged if I forget to centralise the head!

Thanks
Ash]]> ashhhhh Repetier Thu, 14 Feb 2013 19:11:45 -0500