Bed-Level Tester (e.g. MP Select Mini)

thingiverse

Beyond the sheet-of-paper test, if your 3D printer bed is manually levelled it's nice to have a test print that lets you see how the first layer of lines is being deposited. This is a simple set of squares at the corners with circles within them that gives me a quick test of my MonoPrice Select Mini setup (12cm cubic print volume). It's also a good way to test for adhesion. Sometimes straight lines appear to be working fine, but a curved or diagonal trace doesn't stick, reminding me to check the level, or to ensure my tape-plus-glue approach is up to par. The pattern is 105 mm square. I recommend printing this with a 3mm brim for a good quick check. Most often I never print this pattern for more than a few minutes, and have never let it run all the way through, 'cuz I see what I need to know pretty quickly, after the first layer is down. The circles are reassuring too - if they don't look round you may have an aspect ratio issue. If you did let it print all the way through, it's only about 5grams of filament, so no big deal if you forget it and it runs through. If you do accidentally print the whole thing - share an "i made one" picture, I'd love to see how it looks. :) Perhaps I'll add some additional features to it at some point, but for now, it's pretty useful as is.