Quick post: The robot now has a hanging frame, which makes it much easier to work on!
Continuing from the first post, I made some progress on the extruder while also starting construction on the RepRap frame.
For the extruder idler block, a piece of threaded rod was cut down to size. Based on instructions this should have been smooth rod, but since it simply sits through a bearing there isn’t any issue of friction.
Fitting two hex nuts to the top of the extruder where the idler is attached required some extensive filing which ended up in the plastic splitting at the weakest points and a small part of the plastic breaking off, but the issue was easily fixed with some two-part epoxy. Once the epoxy has set and I get the required M3 bolts, the extruder assembly can be completed.
Switching to the frame construction for a change of scenery, the first task is to put together the two “frame vertex triangle”, i.e. the triangular frames which make up two opposing sides of the printer.
Next, the frame starts taking shape by connecting the two vertex triangles. A few more threaded rods attached and it starts looking like an actual printer!
The frame remains untightened for now, as I need to replace the large washers (M8, 24 mm diam.) on either side of the 608 bearings with even larger ones (M8, 30 mm diam.).
Next step will be to calibrate the frame, start attaching the remianing rods and complete the extruder. Coming up soon!