This is a grid for Gridfinity where you can easily attach multiple grids together for those of us that have smaller print beds.

The grid can be printed in PLA or PETG.  I recommend .4mm nozzle and .2mm layer height.  I put the perimeters up to 14 as it's faster than doing infill.

The connectors I would recommend printing in PETG to allow them to flex slightly when you insert them.  You can print 30 of them at once really quickly.  But slow the print speed down to ensure the print quality is very high (on my MK3s, I slowed it to 10mm/s).