Could not fit part A on my Dremel Model 395, but part B fit. I also wanted some better support in the toolpost holder, so I used 2x part B and connected them together with a longer piece for the toolpost holder.
I have a BXA size toolpost, so I made the mount 15mm. I added a model for 0XA/AXA size toolpost, where the mount is 12mm.
This needs to be printed with support. I used PLA and 0.2mm layer height.
The author remixed this model.