Scara support ?
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Nice write-up and video!
One thing you might consider is increasing the bed width or depth to about 450mm. You won't be able to do a 450 X 300mm print, but you will be able to print about 450 X 150mm, which may be useful. When using G29 to probe the bed, you can set up the grid in M557 to cover the entire plate, because points that can't be reached by the head will be skipped automatically.
I did a similar thing with my SCARA printer: I increased the Y axis length declared in the M208 commands from 300mm to 420mm. That allowed me to print a 400mm long submarine at the TCT show.
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There will be an evolution of my scara,
surely a removable arm that can fit on a table or other support to enjoy the entire surface …
Exemple (Google photo taken at random):
good
==> That allowed me to print a 400mm long submarine at the TCT show. -
Hi David, my question about the scara support seems to fit in this thread …
I'm currently using a Duet wifi to control a delta and now also a Duet ethernet to control a Scara. In the latter one I would like to implement a scond Hotend (for the configuration please see the attached sketch). Is it possible to implement the gamma angles in M669. Currently alternating between the hotends is only possible with manual editting M669 Bnnn:mmm according to the gamma angles. Or did I missed something?
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Currently there is no direct support for a tool-dependent gamma angle offset. However, I think you could implement dual nozzle support in the tool change files like this, provided the distances from the distal joint to the two nozzles are equal:
1. Choose the head reference point, either at one of the nozzles or on an arc from the distal joint midway between them. Define the distal joint homing position based on that choice.
2. In each tpost#.g file, use a G1 command to move the HRP to a known XY position. Then use a G92 command to tell the firmware where the nozzle for tool # is when the HRP is at that position.
3. In the tfree#.g file, do the reverse i.e. send the nozzle to a known XY position and then use a G92 command to tell the firmware where the HRP is.
4. Put T-1 at the start of homeall.g (and homedistal.g if you use it) to make sure that homing is done correctly.
