Just like to correct a previous mistake in filament measurement - as well as

Just like to correct a previous mistake in filament measurement - as well as about calibration cube size.

Originally shared by Yuan LIU

Metrology 2.0.

It’s been some time since I was convinced that the new GP3D “Nature” PLA filament was 0.05mm thinner than its nominal diameter. (Sign in - Google Accounts) When I puzzled over the apparent shortage in new calibration cubes, however, some more experienced 3D printer advised against “plastic bodied calipers”. (Sign in - Google Accounts) Although I wasn’t sure whether the body specified as carbon fibre qualifies as plastic, I woke up to the realisation that that caliper’s precision was 0.1mm. How could I make assertions and derivatives over matters of 50µm with tolerance of ±100µm in the meter?

Hence the new caliper of 0.01mm precision. (4th picture) I was disappointed that it should arrive with no battery in the case. (Yes, they shipped a fitting case, but not the battery.) I had to go to dollar store (where else) and look up on spot the mumble-jumble of LR44 vs SR44, for the store only carried the former. (I also discover that this caliper is one that does not shut down circuit when placed in “off” position. Any slide action turns the meter on.)

What did I find in the filament? GP3D is right on the mark with nominal diameter! (First picture. Measured range from 1.74mm to 1.78.) The Ares original multicolour filament, on the other hand, is still rather short at ø1.68mm. (Second picture.) Then I remeasured the cubes which I thought were 0.2mm short on each sides. All dimensions are actually on the mark, too! (Well, I guess the cube dimensions are really more a function of slicer-printer than extrusion.) Cubes printed with the old filament are slightly larger, but not by much, either.

Power to Ares 3D printer! Lesson learned about precision of instrument. (Additional lesson about cheapskatery: The stainless-steel, precision caliper is cheaper than the less precise one.)