Monoprice Mini (MPSM) WK9.1 extruder base with access to set screw
Description
**Update 23 Aug 2021:** Added a WK9.2 version which doesn't need the separate nut for the collet, and uses printed-in M6x1.0 threads. Based on my experience with printed threads it should be perfectly fine. I've been using my Monoprice Mini pretty heavily, and started having problems with inconsistent prints that seemed to be related to extrusion problems. Investigating, I found out that the teeth on the extruder gear were worn out, so I ordered [a replacement](https://gigdigit.com/extruder-gear/) from [Gigdigit](https://gigdigit.com/). When I got it, it took a little while to get the old gear off, and research had me discover that heat was needed. Some quick work with a heat gun and the old one popped off. I've been using [wileykyoto's](https://www.thingiverse.com/wileykyoto) great [MPSM V2 Improved Extruder (WK9)](https://www.thingiverse.com/thing:2756509) for a while, and I wanted to cut the PTFE tube to the exact shape to get it to follow the rollers, and realized I needed to be able to access the set screw (aka grub screw) while the extruder gear was installed, but unfortunately the WK9 design just slightly obscures it, so I couldn't tighten it down when it was in the right position. I tried modifying the original STL in SketchUp, no luck. I tried MeshMixer, again, some decent results but nothing I was actually happy with, so I got busy and redrew it in Fusion 360 so I had a proper parametric model to work with. Although this is drawn from scratch, it is basically a direct copy of the WK9 base, with a slot added to allow access to the set screw so I could install or remove the extruder gear with the base installed. In case you're wondering, _yes_, you could achieve the exact same result by printing the original WK9 base and working on it with a hacksaw, a file, or a small drill. Like most of my things, I'm more about the journey and the learning process than the quick route to the destination.
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