This is a mashup of hein's desk clamp and Gridfinity. I replaced the top piece of the clamp with Gridfinity baseplates. I made 2 versions.

The first version is a simple 1U high baseplate with holes for magnets. It is intended to mount directly to the desk as normal but have a Gridfinity top that can sit next to other Gridfinity baseplates. It's a bit thin, so use a strong filament that doesn't bend much and do not use for anything too heavy.

The 2nd version clamps and existing Gridfinity baseplate down the the desk, negating the need for screws or weights, and gives 2 more base squares. This one is 2U high to try to make it a little stronger than the other version, but again don't expect it to perform like steel. V2 of the model attempts to make it slightly thicker at the top joint to reduce flex.

I am including the Blender file I used to aid in further modding.

For attachments and other parts for the clamp please see heins original post. I may add some of the other required parts to this listing later for archival/preservation reasons in the future.

======================================

I merged pieces of the following in this model:

Desk Clamp (Modular) by hein - @hein - https://www.printables.com/@hein https://www.printables.com/model/508193-desk-clamp-modular Creative Commons (4.0 International License) - Attribution-NonCommercial

Gridfinity Magnet Light Baseplate by RIP_Plo-Koon - @RIP_PloKoon - https://www.printables.com/@RIP_PloKoon https://www.printables.com/model/250550 Creative Commons (4.0 International License) - Attribution

Gridfinity Baseplates by ZackFreedman - https://thangs.com/designer/ZackFreedman https://thangs.com/designer/ZackFreedman/3d-model/Gridfinity%20Baseplates-60925 MIT License

I believe the most acceptable license for the combined work would be cc-by-nc and also to include the MIT license for Zack portion below.

======================================

Copyright (C) 2023 - Jonathan Hull CC-4.0-by-nc

======================================

MIT License text for Gridfinity Baseplates by ZackFreedman:

Copyright (c) 2023 Zachary Freedman and Voidstar Lab LLC

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

======================================