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BrickalikePRO

Fixing bricks that are too loose

A good piece clicks on, holds when you tip it upside down, and comes off with a firm pull. If yours falls off, work through this list.

What you will see

What to try, in order

  1. Raise the flow ratio by 2 to 5%.
  2. Check cooling. Too little cooling lets the plastic sag and spread the wrong way.
  3. Slow the outer wall.
  4. Try PLA instead of PETG. PLA grips a little tighter than PETG.
  5. PETG: the preset often says 0.95; we found 1.00 works better for fit, as PETG tends to print looser.

Change one thing at a time and test with one piece, not a whole plate.

Good to know

Where we give numbers, they come from our own tests on a Bambu P1S with a 0.4 mm nozzle plus advice from other makers, and other printers need small adjustments. Our print settings page has the full table. Printed bricks are not toys: small parts, a choking hazard, not for children under 3.