I bought this HysiPrui PEI build plate from Amazon for my AD5M and wanted to print the handle part.  

I found that the build plate was added to OrcaSlicer by FlashForge.  

Source: https://github.com/SoftFever/OrcaSlicer/tree/main/resources/profiles/Flashforge

Commit:   https://github.com/SoftFever/OrcaSlicer/commit/a106625f84929a0634d22dbc4c33fa9171502718

I imported the STL into OrcaSlicer and split it so that it could be printed.  I used some M2x4 screws and M2x3x3 heat set threaded inserts.  (M3 seemed too big to work.)

Orca Slicer is licensed under the GNU Affero General Public License, version 3.

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UPDATE: 8/16/2024

Got a new flex dipped build plate from Sliceworx.  

I made a version that will fit m2 hex nut and m2*6 screws.  Put in a pause at layer 15 3.00 so you can put in the m2 hex nuts and then resume the print.  The hex nuts will be embedded into the handle.  (I'm currently working on an m3 version, but they are bigger than the space and is proving difficult.)