The most important issue to arise was failure of the heated bed soldered joint power connection. Huxley #710 was printing my latest masterpiece which is one of the largest prints I have ever designed. It's 91 mm in diameter and 38 mm tall. Of course that details none of the complexity in the part which is one of three mating parts that are required to fit together quite precisely. The interconnection between the mating parts is a three feature bayonet fixing at a 120° spacing on the diameter. If time permits I will mock up an example at some point.
|Huxley heated bed PCB 3 way terminal block|
|Huxley #710 heated bed terminal block solder pad repair|
The root cause is straight forward to understand, as you have no doubt guessed from the picture of the power connection to the table. The PCB 3 way screw terminal is essentially exposed to a side force. In fact, thousands of times as the table moves back and forth. It's likely that the PCB 3 way screw terminal was not seated correctly and so after around 300 meters of printing, the soldered joint was the weak point and turned into a dry joint. The rest as they say is history.
To improve the situation the connection to the heated bed might have to be made in line with the direction of travel and additionally perhaps the cable clamped to the PCB to offer a strain relief.
So Huxley #710 sprang into life again and then maintenance incident number two occurred
Z coupling detachment
Both Z couplings had become loose and were no longer attached to - well anything. So I reconnected the Z couplings and re-aligned the system, which I have developed some proficiency in now.
I am starting to think I may be a heavy user of my RepRap Huxley.
Another project spin off - Nokia LCD CAD STEP model
|Spakrfun Nokia 5110 LCD Display|
So if you would like a CAD model of the Sparkfun Nokia 5110 LCD display
|Sparkfun Nokia 5110 LCD Display CAD model|