without instructions or assembly drawing.
Here are some comments and hints on the design / my build.
1. Check the polymer threaded parts, it is important that the internal threads in the X-Y forearm are formed correctly, and the other threaded parts engage properly, -- it must be printed correctly to hold the the arms together firmly at the hotend.
2. I am using 13 mm 5 ply birch plywood, this seems to be too thick for the 16mm M3 bolts and I had to countersink them into the back of the board. Check your build boards, you may want to obtain longer bolts. M3x20 vs M3x16 in BOM
3. I started using M3 stop nuts with nylon inserts, these seem to bind and tend to rotate in the hex hole in the plastic parts, rounding out the hex hole. I have replaced those with regular nuts and it seems to work fine.
4. I'm using washers between the bearings in the arms, if the arms are just slightly bent they bind, so the washers space them up a bit to allow them to rotate freely. This tends to lock the inner races of the bearings together and provide free rotation.
5. It also appears that the bolts (M8x70) holding the table arms to the back board, are too short, probably because of the thicker plywood, I will replace those with longer bolts, The M8 captive nuts with the nylon inserts may interfere with the table.
6. The table is as wide as the opening between the arms, so there is no room on the sides of the table for any type of parts or clamps for attaching heater or build material. I plan on using glass for my build surface, so I will have to put the parts to hold the glass, on the front and the back of the table.
Are table levelers required?
7. I am planning to use an "AirTripper" extruder. I have the mechanical parts and am printing the plastic parts. Nick's extruder using UHMW block, where the UHMW will have to be milled.
8. The wiring hole was nicely covered by the X-Y motors, new holes farther down were drilled. It seems that the wire channels the on the back are really not necessary, and one might just want to use cable ties or clamps. (I am using 4 wire shielded cable on the stepper motors)
9. There are no set screw holes in the Z axis pulley, I drilled and installed M4 set screws
That's it for now, hope this is helpful, the BUILD continues
