Page 1 of 1

How to print without induction sensor on 1405

PostPosted: 2017-May-Tue-01-May
by manganese
As documented in another thread (http://www.printrbottalk.com/forum/viewtopic.php?f=15&t=11365) I've been having problems with my induction sensor and the board. I'd like to try printing without the sensor (don't have the chops to replace a transistor and don't want to but a new board just yet - want to make sure the printer can really print before investing much more in it).

Found this http://www.printrbottalk.com/forum/viewtopic.php?f=113&t=9446 useful post and was wondering what other advice you'd suggest for successfully using the 1405 without the z probe. Should I try to add springs to the print bed to de-risk gauging the bed? If so where could I find the right springs? Any other ideas?

Thanks!

(Edited to correct the 2nd link)

Re: How to print without induction sensor on 1405

PostPosted: 2017-May-Tue-08-May
by RetireeJay
The transistor (if truly bad) sits in the path between the Z "endstop" sense pin on the board and the corresponding input pin on the Atmel chip, so substituting a mechanical switch for the probe still won't work.
One alternative for you, if you have a knob on the top of your Z screw (or could put one there) is to use the homing switches for X and Y, but home your Z axis by hand. This works because when you power-on the 'bot it assumes all axes are at zero. The 'bot won't "know" you are doing the manual adjustment, so it still thinks it's at zero after you make the adjustment. People did this with the very first edition of the Simple. You would not use the global "home" command and you definitely would not use the G29 command ever. You've got to make sure your slicer doesn't put a Z home command or a G29 into the G-code. But with this approach you will have no worries about the head crashing into the bed; the firmware never allows the head to move to a position less than zero.

Re: How to print without induction sensor on 1405

PostPosted: 2017-May-Tue-09-May
by manganese
Thanks, RetireeJay! Whoops, looks like I linked the wrong article in my original post - here's the one I mean to post, specifically the last post by Sagbot http://www.printrbottalk.com/forum/viewtopic.php?f=113&t=9446.

Do you know where I can get the springs like those that were on the previous versions of the simple makers kits?

Thanks!