MILS Plate with channels for Lego (and compatible) modular buildings

Maybe you don't want to invest so much money in foundation plates, which can be quite expensibe. Those “MILS plates” keep the whole modular building set nicely stable and with these plates you can update your city layout easily. (More about MILS plates on YouTube video by Bricksie.)

My models are designed from scratch for two most common plate dimensions: 32×32 and 32×16 pins. They are designed to be printed vertically at once. (Which is achievable on Bambu Lab and other desktop printers with 32×16 version at least.)

If you are displaying modular buildings on shelves from side, a 32 or 16 pin long holes cover will also be useful.

Built-in channels are practical if you are also dealing with lighting wiring.

Instructions:

• Print without supports, vertically. Diagonal on the print bed. 
• PLA is fine here, no need of dense infill or too many walls.
• If you use technical pins for joining MILS plates together, open the thin barriers in the vertical holes with a sharp knife or drill bit (they are blinded for printing without supports).

Tip: Please, print the smaller model first and adjust your printer settings for the best result. What works for me won't necessarily work for you on the first try.

EDITs: 

240107 … Cover plates upgraded by a bit tighter pins.

240108 … Cover plates V 1.4, higher to cover original build plate with the gap under it.

240203 … Added Cover plate V 1.4 (higher) with the waves design for river/sea 32×32 MILS modules.