Yes, I have have been working on my roaddog printer over break.
First I caused a problem with my hot end when the nozzle became loose and the entire assembly spun around. Upon tightening the assembly I placed the heater block in contact with the Aluminum heatsink and didn't notice this and hence spent (2) days scratching my head as to why the hot end would not heat above 150C. Live and learn.
Next, my filament cooling fan is not cooling behind the parts. This is evident when I print medium to large parts--you can see it in the surface texture and finish. I will need to come up with another fan solution.
Also, I'm in the process of adding a new communication interface a raspberry PI 3 B. With this device I will use Octo PI to print via the cloud. Happy days, the large LCD panel problem has been resolved. Resolved but not applied I found that the older version of the Arduino 1.62 was not working for my display. I bumped up to 1.80 and we are now good to go.
One or two other things. I've committed to printing the 6 foot tall Saturn V rocket and Gantry. This is a huge undertaking in time and money but I simply must do it. In that, I need a larger bed size printer so I'm now building the roaddog II 260mmx300mm bed. Virtually the same build as the roaddog I except for a larger bed and I will use dual power supplies 12v for controls and hot end and 24v for the heated bed. The bed will still be controlled by Marlin through a combination Arduino Ramps configuration and the 24v will split off using a DC SCR 12v to 24v dc isolated control. Granted this will just be on/off PID however I have faith that this will be sufficient if not I can always upgrade to a dedicated MOSFET for more granular control.
One other thing I'm now printing ABS with some success, however, I now believe that the quality of my ABS filament is in question. Once I can afford it I will buy some quality ABS and see is that makes a difference.
That's it for now. Pictures will follow.
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