R2-D2 Astromech Droid Holoprojector with separate Grasp

R2-D2's “Holoprojectors” are one of the few “found parts” on the original 1977 costumes and filming props; they began life as reading maps for the Vickers Viscount passenger aircraft.  To prevent people from burning their hands on the incandescent bulb powered metal lamps, the very end part - the sort of “nozzle” bit - was actually made of plastic.

In “A New Hope” you can see that mostly the ends of R2's holoprojectors are black, not blue or silver.  In a few places they're a slightly different shape, and silver coloured, because the black plastic grasps had broken off.  By Empire Strikes Back, many of the holoprojectors were actually resin casts, and the entire unit began to be painted silver - but in the first movie, they're usually a different colour.

I wanted to easily print my grasps in different colours while still being able to use current Mr.Baddeley and R2-D2 Builders' Club designs.  Not finding anything that did the job, I remixed two other designs to come up with this.

The main body of the HP comes from Hammer32's “Threaded Holoprojector, Slip Ring Holder, and Back for Mr. Baddeley's 3D Holoprojector and Flthy's Light Kit” as shared on Thingiverse:

https://www.thingiverse.com/thing:2985976

The grasp comes from R2maker's “Vickers Viscount 700 Series Reading Lamp (R2-D2 Holoprojector),” a very detailed reconstruction of the original reading lamp from period documents, also shared on Thingiverse:

https://www.thingiverse.com/thing:55991

The HoloPlug is unaltered from Hammer32's upload and is shared here for convenience.  Likewise, the Grasp and Threads files are unaltered from R2makers and are shared here for convenience.

Most printers are not accurate enough to make the threading on the Grasp and Threads actually functional.  R2maker used a tap-and-die set to clean them up; they also say that other makers had success printing the Threads at 98%.  

I found that on my Bambu X1 - which is very accurate - reduceing X and Y to 98% worked well, but on the Ender-5 - which is less accurate - the threads were still too rough. So, I made the “Thread Replacer” part which simply uses a friction fit to hold the Grasp and Holoprojector together.  You don't need both the Threads and the Thread Replacer.