Edit 05/02/2019: Added an alignment tool to prevent binding.
I upgraded my d300vs/+ to a flex system with a 310 diameter.
This mount is to be used instead of the original bed clamp and fsr mount, as it's all integrated. The idea is that the mounts will self align to the mag base. I am using the mag base with the original aluminum heat spreader so the stack is:
PEI Sheet on SS Flex sheet
Aluminum Heat Spreader
This design has been tested on 3 other users so it was time to upload it to thingiverse!
Definitely, recommend using PC+ or ABS for these mounts due to their heat deflection.
I hated to align the bed clamps and FSR mounts, so I integrated both so that they're self-aligned to the mag base.