This is the ultimate calibration test to print to understand how much clearance you must leave between two parts to not melt them in a whole object.
Print it and press the pins in descending order (from lower right, going left, then middle right going left, at last first line going left). The last pin you can detach (without a hammer :) is the one identifying the minimum space you must leave between objects in your designs to not print a whole block.
The clearance of the pins are as follow:
(0.2mm) (0.3mm) (0.4mm)
(0.5mm) (0.6mm) (0.7mm) (0.8mm)
(0.9mm) (1.0mm) (1,1mm)
What you want. I use to print at 0,2mm per layer
You can experiment different printing settings to check if needed clearance is reduced or not.
Why I made this?
This started when I printed an object with interlocking parts that printed as a whole block.
So I've found this beautiful test http://www.thingiverse.com/thing:1420023 and wanted to print it but... hey, it was huge! Much time, much filament.
So was born the idea to optimize at maximum the object to minimize time requirement and filament to use.
I made some intermediate objects and optimized and optimized... arriving at the finish line with this object.
Optimizations included in this object
The bigger elliptic base ensure the test sticks well with the printing bed (as previous try did not...) but going upward in printing direction only walls outside the pins are printed to ecnomize unneeded plastic.
Pins are disposed so to minimize size and volume and clearance values (from 0.2mm to 1.1mm) are calibrated so to accomodate every type of printer/settings.
The edges on the bottom of the base have all a chamfer of 0.3mm so that first layer, that tends to be larger than other layers, does not interfere in the test.
The outer of the ellipse is rounded to be better pushed with hand without hurts and pins have a 2mm fillet to have a nice feeling when pushed out.