I just received my replacement printer after a catastrophic failure. The print that caused the failure adhered to the bed and the wiper must have kept trying to wipe, which must have caused the resin to spill over the tank wall (happened twice, the second was catastrophic). The part was small, so the amount of resin required was also small. However, the resin cartridge was completely dispensed while it tried to fill. Considering that it was a brand new cartridge, you can imagine the amount of resin that was spilled.
I have a lot of questions/recommendations:
Known value - how much resin is dispensed (open loop) AND how much
resin the print will use - using half a tank head pressure (average), plot
amount dispensed per unit time. If exceeded, then fault
Known value - time between dispenses and number of dispenses - if
unusual amount, then fault
If the part is welded to the tank bed, then the wiper cannot fully
actuate. There is a wiper homing sensor there. If the sensor is not broken during a
wipe, there is a problem and fault. Or, during a wipe, if the wiper is
stuck on the sensor, then fault.
Is there any socket communications to monitor the step of operation? I cannot have this same problem again. If the error handling cannot be implemented for whatever reason, I need to monitor it externally in order to stop the print under what I deem an error condition.
I can wire in parallel the homing sensor on a PLC to see if the wiper is stuck or not actuating or put in an encoder to see if it is moving. I need to know when this wiping operation is happening in order to check this. I would like a socket communication that will send me the printer status so I can parse it and check
I can add a paddle flowmeter to the cartridge to see how much resin is being dispensed. At a very minimum, I can check wire in the solenoid output on the valve to count the number of valve open commands and the duration and find an average flow for the average head pressure of the resin. I would like a socket communication that will send me the printer status so I can parse it and check.
Oh, and I need a way to send a command to the printer to stop the print. I really dont want to have to put the main power on a relay and slam power when my PLC suspects an error
Thanks. I am hesitant to use the new printer until I deem that this problem is solved and I can have confidence in it again.