One hex cell with the joints built into the walls. no clips, no cable ties, just push together and pour. Pick your printer and use case and the rest configures itself. 
ABS spacing, shrinkage compensation, drainage holes, solid base, bed layout. 
All automatic. Seven cells makes the honeycomb flower.
More makes a path. One makes a planter. Works for concrete, resin, hypertufa, or a workshop organiser. Boost it if it saves you time. Post a photo if you print it.

FormbyForge

Mazda MX-5 NC 16" / 56mm Centre Caps

My father-in-law asked me if I could print something similar to something he saw online for a popular DIY store. I said yes!

Print 7 of them to create a flower bed. Print extras for a pathway. Use one as a planter. Use ABS or ASA for outside, PLA for testing or other things.

Hexagonal Mould - Modular Honeycomb System

I’ve spent a few weeks iterating and testing to get the fitment "just right" for these 56mm centre caps. Specifically designed for the 2008 Mazda MX-5 NC OEM alloys, I do consider these to be a good upgrade over the originals. I have tried some of the other 3D printed caps out there and found they just didn't fit, they were too brittle or had a massive overhanging lip.  

I've found designing the caps to be a good exercise in using Tinkercad and then switching to Fusion.

I need to reprint this, seen a stress crack in the test pla. will redo it with petg.