This is the MakerGrid, it's a grid system for connecting various things with clips. Currently it's primarily designed to hold in place temporary electronics project setups, but I already used the parts for various other things (filament guiding, on spool holders, ...). The clip system is
generic enough that you can firmly connect anything to each other. The 2cm grid keeps things aligned so that you can easily extend your setups.
The 12x12cm bases with the holes are printable even on small printers and can be clipped into each other and be extended easily to form larger bases. There are different types of bases for various use cases and also to reduce printing time.
Please also visit my Github page for a better overview, more parts and to stay up to date: https://github.com/WeirdConstructor/3DPrining_MakerGrid
I also posted about this concept in my Blog: https://m8geil.de/posts/week-of-weird-constructions-2/#makergrid-3d-printing-for-modular-electronics-prototype-setups
You can print these parts in any settings you like, but I primarily designed them for 0.3mm layer height with a 0.4mm nozzle.
If you experience difficulty in printing the clips or they are not holding tight enough: You can try setting your slicer to print the outside walls first and then print the inner walls. It also helps increasing your line width to something like 0.44mm or even 0.5/0.6mm can work nicely. If you still experience your clips are too wiggly, you can always increase the flow (or extrusion multiplier) a bit, this way your clips might fit more tightly.
There are lots of other MakerGrid models on Printables, search for “MakerGrid”.
If you want to design your own parts with MakerGrid holes, use the “clip-clip_hole_cad_export.stl” to subtract it from your parts in CAD. There are also single hole STLs:
The author hasn't provided the model origin yet.