|Alternate coupling fitted to Huxley #710|
Failure seemed to happen either due to cracks in the printed coupling or movement of the clear plastic tube. Additionally fitting the coupling was tricky as the thread engagement on the design is difficult to achieve, particularly when on the last screw. The access is limited so this typically meant Huxley #710 had to be disconnected and moved to allow access to both sides of the printer. Then of course a bed leveling operation is implicit with coupling failure. Being prior to the glass bed and discovering that Huxley #710's Aluminium table is distorted so can not be levelled. This was a particularly trick task.
RepRap Pro produced an alternate coupling
which can be seen below with some pictures taken during fitting of the coupling.
|Huxley #710 Z Axis Original Coupling Installation|
|RepRap Pro Alternate Z Axis Coupling|
|Huxley #710 Original Z Axis Coupling Removed|
|Adjusted for the new coupling - Wish there was a little more tube|
Finally the print head height was checked and adjusted by rotating the motor to bring the X axis back into parallel to the table.
|Huxley #710 with updated Z Axis coupling fitted|
On the left in the picture you can see some nut covers I printed very early on to protect from the sharp edges on the ends of the threaded bar used to hold Huxley #710 together. I did this even though I spent considerable time dressing cut ends during the build. It finishes the build a little more cleanly and offers some protection from scratching.