This thing contains few designs I created during my DremelCNC build that I decided to share.
STD_Zcarr-46 - This is my rework of the standard Z carriage to allow using of 8mm bearing pillow(s) . Other differences from the original are: pockets for the (140mm x) 12mm rods are trough n both sides, allowing for easier rods insertion; and: it is drawn in a way that allows to be printed laying on it's side without supports, which makes the part stronger, because of the layer direction that way.
(Note that using pillow block(s) is optional - it will support "stock" way of mounting as well. )
nema17_top_mnt - this is a bracket to mount the NEMA17 stepper on top of the pillow block if you go with that approach.
STD_Z52-46 - That is a slider that allows mounting the 52mm spindle with the metal bracket that comes with the kit.It's much preferred to any printed brackets because it helps a lot with the thermal dissipation (~46C with it vs ~60 with a printed analog) plus it's much more stable mechanically. Note that this version may or may NOT work for you - it relays on a thread in the plastic to tighten the metal bracket to - this worked for me with my PETG printed part, but I can see it failing in some cases. If that happens, you may look at the 42mm variant which allows to use 6mm threaded rod and use nuts to tighten it from both ends. But that would also require reprinting the Z carriage also and use my 42mm version. (42mm is the distance between the bearings where the standard is 46mm). Use 6mm tap to thread the holes if you can...
- Zcarr-42_v04 + Z52-42-v04 - these are the Z carriage and slider for 52mm spindle metal bracket that use 42mm distance between the bearings, thus allowing using a pieces of 6mm threaded rod and nuts from both ends to mount the metal bracket. It was my initial version before I realized threads in the plastic can actually hold up good enough.
Print settings suggestions:
-Use PETG - NOT PLA!! At least for the slider.. Spindle gets hot and PLA starts to deform
when in contact with something even slightly warm,
- Use thicker walls, this gives more strength then high infill. Like use 1.2mm or even 1.6mm walls and top/bottom and then 20-40% infill, if you use Cura, the Gyroid infil pattern makes the parts super strong..
FreeCad source files and step files are included. I can eventually respond to requests for slight changes if someone has an idea how to make it better..