Mantis Update

[mandryd]

• [x ] The mod, firmware configuration or slicer profile is in the correct category folder. Printable mods go to printer_mods/, firmware configurations go to firmware_configurations/, slicer profiles go to slicer_profiles/. Create a subfolder with your name, and place the mods in a subfolder with a descriptive name within that folder, e.g.: /printer_mods/FHeilmann/flux_capacitor
• [ x] Folders names MUST NOT contain spaces. If possible, make sure file names also do not contain any spaces.
• [x ] For each mod, add a small README.md file to its folder with a short description of what the mod accomplishes. This readme can be used to add pictures, give assembly instructions or specify a bill of materials if the mod requires additional hardware.
• [x ] The PR modifies the top-level README.md of the category folder adding the contribution to the table. Read the top part of the file for instructions on how to do this. Please preserve the alphabetical ordering while adding new rows. Make sure to fill out the compatibility matrix to indicate which versions of the Voron printer the submission is compatible with.
• [x ] The mod/configuration/profile has been tested by the person submitting the mod and/or other Voron users. Make sure to add information about how the mod was tested below.
• [x ] The mod is not merely a slight modification of an official Voron part, configuration or profile (i.e. an official Voron part with a few mm added or removed or a slicer profile which only modifies a few values). (When in doubt, contact one of the admins in the Voron discord before submitting the PR)
• [ x] Submitted STLs are printable without support. (If the mod does not meet this criterion join the Voron discord and ask the other users for advice on how to modify the mod such that it does not require supports)
• [x ] Submitted STL files are not corrupt. (This can be tested by opening the STL in PrusaSlicer and checking if mesh errors are reported.)
• [x ] Submitted STL files are oriented and scaled properly for printing.
• [x ] Submission includes a CAD file in the form of a .STEP or .SCAD file
• [x ] Submitted firmware configs or slicer profiles contain no sensitive data (e.g. API keys).

Which mods/configurations/profiles are added by this PR?

Added Duct Braces, better flowing dragon cooling ducts, newer hotend mount that allows the sherpa mini to be braced.
Updated readmes for STLs to print, added documentation on the duct bracing, updated some of the readmes for clarity and to reflect the new updates to mantis. Updated the CAD files.

How was it tested?

tested by myself and several other users.

Any background context you want to provide?

Screenshots (if appropriate)

Further notes

[mandryd]

Hey there. Thanks for the suggestion. However I don't think the changes are necessary. The hotend mount has been exactly like that for a long time, and a lot of people have successfully printed this piece without issue.
The circular hole prints pretty well because it is a very thin wall. I think it is better to need some slight trimming (which isn't generally needed) and avoid having any gaps there to the bottom of the dragon heatblock (avoid a venturi of air from the heatblock up into the cool side). The side exhaust is a short bridge and it also prints very well. The more open that hole is, the better the exhaust from the hotend.

[mandryd]

Any comments? This part was approved several times in the past

[flatnesstester]

I have neither merge permissions nor experience printing this part so sounds good to me. :D

[cbc02009]

@mandryd Sorry, been really busy recently. I think what you say makes sense, so I think we're good to go.