Dremel bit holder no support

While I agree with RGN01 that tuning your printer to be able to make good supports is a good and proper thing I also lived for a long time without the ability to print supports so I totally agree with Dapug that printing without them has its benefits as well.
Here's a simple remix that fills in the holes and makes it a little more substantial which is good if your not mounting it and easier to print in either case.