SR6 + OSR2 Desk Mount - Adjustable

There have been many wonderful mounts shared by the talented individuals on the TempestMax discord.  However, each one of them did not meet my needs.  I wanted something that could be slightly adjustable in the z-direction, and utilized minimal hardware.  After reading the discussion in the discord about Hirth joints, I was inspired to combine it with the mounts other so graciously shared.

Although I have yet to test this mount “in action” as it were, I have yanked on the mount and it appears robust enough for the application at hand.

I have included separate files containing the two joints so that they can be edited easier, or placed on other mounts/models if people wish.

Please Note: I do not have any formal CAD software training and utilized TinkerCad to make this mount.  As such, the model geometry is not pretty or symmetrical.  I encourage others to take it and refine it if they see fit! 

Needed Hardware:

• 1 M8 bolt
  • I recommend a minimum bolt-length of 20mm, however 25mm would work better. For reference, the bolt in the pictures is 35 mms
• 1 M8 Nut

File Selection:

Base Plate: There are two versions of the base plate.  One with a more “Granular” Hirth joint that has beefier teeth and allows for less fine adjustability, and one “Fine” Hirth joint that allows for a little bit more adjustability.  Both are limited in the fine-adjustment possible as I was worried making the Hirth joint teeth too small (and thus more adjustable) would overly compromise the joints stability/holding power.

Desk Mount: There are two desk-mount options, both with either a “Granular” or “Fine” Hirth joint.  The smaller mount is designated by and “S” and the larger mount is designated by a “B”.  The larger desk mount is approximately twice as long as the smaller one, and is much beefier.

Screw: Both desk mounts utilize the same screw model.  However, the larger mount utilizes two of them, rather than one.

Bolt-Knob: A bolt-knob is not required, but will allow for adjustment of the joint without tools. I recommend clicking on the link to Eng. Yehia's project and downloading his wonderful M8 bolt turn-knob! 

Printing Suggestions/Settings:

Although not strictly required, I recommend printing all parts of the mount in ABS due to the forces being applied to such a small joint.  I have not tested the mount in PLA, however it should work.  Additionally, the desk mount Hirth joint will require supports as it is a 90 degree overhang with no supporting geometry.  I recommend placing the desk-mount on the build-plate such that the Hirth joint teeth face upwards.  The base plate and its joint do not require supports despite how they look.

The following settings were informed by the official Voron build guidelines. Although these are not Voron parts, the Voron community has spent a lot of time determining the “sweet-spot” of strength vs material usage.  That “sweet-spot” is in reference to ABS, other materials used to print this mount may vary in what works for you and your printer.

Walls: 4-5

Top and Bottom Layers: 5

Infill Type/Percentage: Cubic 45%

Supports: Orcaslicer Tree supports

Assembly:

Assembly is pretty straightforward.  If, as I did, you are printing this in ABS, know that you will likely have to ever-so-slightly widen the bolt hole due to material shrinkage (unless you are utilizing shrinkage compensation slicer settings).  If you are printing in PLA the bolt-hole should be perfectly sized.

I utilized the Hirth joint and bolt-knob from Eng. Yehia's 2020 extrusion model for the Granular version of the mating surface. Thank you!

https://www.printables.com/model/202276-hirth-joint-for-20x20-extrusions

I utilized the Hirth joint from ledres wonderful Hirth joint example, found here. Thank you!

https://www.printables.com/model/114737-hirth-joint-with-source-files-and-documentation

I have also utilized several models shared by the wonderful and generous members of the TempestMax discord.  Thank you for sharing your mounts with everyone, and for your hard-work/expertise.  This mount would not be possible without you creating them.