Sort of self explanatory, has a hole on the back to attached to Lego size pegs.
Printed on Bambu X1C PETG, 0.08 layer height with a 0.4 nozzle.
PETG very tight fit with shrink you may wish to scale up to 100.5%
PLA will probably fit nicely at 100%
Added Smooth version for printing face down with Bambu AMS or whatever MMU you happen to have and included Fusion360 f3d file
The author marked this model as their own original creation.